Skip to main content
Skip to main content

Slack SOC 2, ISO 27001 & Security Compliance Certifications

Before you share customer data with Slack, your compliance team needs documented proof they can be trusted. ThirdProof investigated Slack across 27 intelligence sources — here's what we found.

⚠ FedRAMP Status: Not found in the FedRAMP Marketplace. Vendors handling government data or CUI must be FedRAMP authorized.

Risk Tier
Tier 4Low Risk
SOC 2
⚠ Vendor Attested
FedRAMP
— Not Authorized
Last Assessed
Apr 16, 2026
🟢IP Reputation: Abuse score: 0%, 0 reports🟡SSL/TLS: TLSv1.3🟢Domain Age: 33.5 years🟢Infrastructure: 2 open ports, 0 CVEs
FedRAMP Status
Slack is not listed on the FedRAMP Marketplace as of March 2026.
SOC 2 Status
Slack has a SOC 2 claim detected on their trust page. Claim is vendor-attested — no public registry exists for independent verification.
Sanctions Screening
Slack returned no matches in OFAC SDN, EU Consolidated, and UN sanctions screening.
Risk Tier
ThirdProof assigned Slack a Moderate Risk tier with 100% confidence across 27 intelligence sources.

26 sources queried. 94% confidence. Every Slack investigation produces both a risk report and an auto-filled security questionnaire — no vendor follow-up required.

Get Slack's Full Report Free →
5 free investigations|Risk report + auto-filled questionnaire|Avg. 7 minutes

Certification & Compliance Status

Need a complete vendor security questionnaire?

Run a full ThirdProof investigation to get 133 security questions auto-filled with source evidence — ready for your next audit or vendor onboarding review.

Get Slack's Full Report Free →
Not Listed on FedRAMP Marketplace

Verified against FedRAMP Marketplace API as of March 2026

Organizations with federal compliance requirements should verify this directly at marketplace.fedramp.gov.

Slack (Salesforce) is not independently listed on the FedRAMP Marketplace. Salesforce Government Cloud is FedRAMP authorized separately.

27 data sources queried per assessment
Reports generated in an average of 7 minutes
SHA-256 verified for audit integrity
Deterministic risk scoring — no AI guesswork
4Tier

Low Risk

Slack

Vendor Risk Assessment

Confidence Score94%

Based on data availability and source coverage

26

Sources Queried

24

Sources With Data

April 16, 2026

Last Assessed

Executive Summary

AI-generated analysis for Slack

Slack (slack.com) is a widely deployed enterprise collaboration platform assessed at Tier 4 (Low Risk), reflecting a strong overall security posture supported by independent certification verification and a clean domain reputation. Positive signals across the assessment include:

Key Findings

  • FedRAMP Moderate authorization independently verified via the FedRAMP Marketplace (authorized 2023-03-06), representing one of the highest-confidence compliance indicators available
  • SOC 2 compliance claimed on the vendor's trust page — a full Type II report should be requested to confirm scope and testing period
  • A published AI data policy explicitly committing to not training on customer data without affirmative consent, with an opt-out mechanism available
  • A minimal, well-controlled infrastructure footprint (2 open ports: 80 and 443) with no known CVEs detected
  • Clean Malware detection service status, clean URLhaus/blacklist check, and a zero-abuse-score IP reputation
  • Domain registered since 1992, managed through enterprise-grade registrar MarkMonitor with full transfer-lock protections Areas requiring attention include:
  • Recent adverse media coverage (November 2025) describing a breach at Nikkei attributed to a Slack compromise, originating from a malware-infected employee device — as reported by CSO Online. The incident reflects endpoint compromise risk rather than a platform-level vulnerability, but organizations should review their own endpoint and access control posture accordingly
  • The subprocessor page was found but could not be automatically parsed; a 2022 archived policy confirms use of subprocessors including Amazon Web Services, Google LLC, Zendesk, Cloudfront, and Fastly, but the current list requires manual verification
  • The marketing site (slack.com) received an HTTP security header grade of C+ (60/100) — the application endpoint (app.slack.com) should be evaluated separately
  • The TLS certificate expires in 77 days; renewal status should be confirmed Overall, Slack presents as a mature, compliance-forward vendor with strong independent certification evidence. The adverse media findings relate to third-party customer environments rather than platform-level failures, and the identified gaps are addressable through standard procurement controls.

Independence Statement

All evidence in this assessment was independently sourced from external registries, public threat intelligence databases, domain infrastructure scans, and media archives without vendor participation or input.

Investigation Findings

4 findings identified for Slack

2 critical2 medium
critical

Adverse Media: security incident

Article from www.csoonline.com: "Nikkei's Slack breach leaks sensitive data from more than 17,000 users | CSO Online"

critical

Critical Adverse Media: Slack breach exposed sensitive data from 17,000+ users

3 recent article(s) reference critical security or regulatory issues for "Slack": "Nikkei’s Slack breach leaks sensitive data from more than 17,000 users" (csoonline.com) https://news.google.com/rss/articles/CBMitgFBVV95cUxNOWl3Zml6UjB1RTQyWVBKT2lodG1taUVKN3B3ZTY3UFRuczNoOHdVUW1pVW1URUMzMTFGRlVvNkNpVDgzc2xLWjRhOG95N01haGF5eE1HWGhLTkpBMHI0NmVxQUVlYllqUHV0ZV9BSmYySEFXYXhmbUZhNFdjZWF3SGRmWUVZZ2hqbkxYWXQ0WGNCc2FOTU9laW5BNGF6NmFOcWhtUm9mRzBVR1ZMMEZnekYxZlVDUQ?oc=5; "Japanese media giant Nikkei reports Slack breach exposing employee and partner r..." (The Record from Recorded Future News) https://news.google.com/rss/articles/CBMiXkFVX3lxTE1FUHRJZmVtdjFLWjUyU3NfOXFsX0ZicEVCMnpUODBIQmJOc3hlLTBkVmtOdDFOXy13YUJYdHpyMS14RkZJa2ZzZUNZLVJoQXZ4XzVMd3B2cFZQa2hSX1E?oc=5; "Nikkei Suffers Slack Breach After Employee PC Malware Infection" (CyberInsider) https://news.google.com/rss/articles/CBMikwFBVV95cUxOcmFZbi1pNm9FaUpzV3dtWTBmSTF3ajBUcDZmSVFxRjZuakRYQWFSemFmS0xVNEppZ0pLeWE1TV9UYkZSdkhld1NGbFBWbTd5MWs4QUhJdVhDUGR5Z3A4WVpodmwzQjZDSTdDQUVJSV9iV1dvZUpvT3RCckhxYUNkZ2RQNDhMLWVLS0lHQ0ZtdlhPQm8?oc=5

medium

HTTP Security Grade: C+

slack.com received a mediocre grade (C+). Some security headers are configured but improvements are needed. Note: This scan was performed on the marketing site (slack.com). The application endpoint (app.slack.com) may have different security headers. Verify the application domain separately.

medium

New Web Presence (< 1 year)

slack.com first appeared very recently. This indicates a relatively new web presence.

Security Strengths

27 positive signals verified

Legal Entity Actively Registered

Business Registration

[Filtered] LEI Registration Lapsed

Business Registration

Sanctions Data Incomplete

Sanctions & Watchlist Screening

Low-Confidence Sanctions Matches Only

Sanctions & Watchlist Screening

No Adverse Media Signals

Adverse Media Scan (Fallback)

Firmographic Data Available

Company Intelligence

Domain Infrastructure Healthy

Domain Analysis

Valid SSL Certificate

Domain Analysis

2 Open Ports Detected

Infrastructure Exposure

Established Domain (33+ years)

Domain Registration

Clean domain reputation

Threat Intelligence

Tech Community Discussion: financial

Tech Community Sentiment

Tech Community Discussion: legal

Tech Community Sentiment

Certificate Data from TLS Handshake

Certificate Transparency

Domain in 50 Threat Intelligence Pulses

Threat Intelligence (OTX)

Clean IP Reputation

IP Reputation

Clean Safe Browsing Status

Malware & Phishing Check

Clean Website Security Scan

Website Security Scan

Compliance Page Located but Content Not Extractable

Trust & Compliance Page Scan

FedRAMP Authorization Independently Verified

Trust & Compliance Page Scan

Subprocessor Page Found, No Entries Parsed

Supply Chain & Subprocessor Discovery

Not Found as FDIC-Insured Institution

FDIC Institution Check

No SEC Enforcement Filings Found

SEC Filing Search

FedRAMP Authorization Confirmed via Registry

Certification Registry Verification

SOC 2 Compliance Claimed on Trust Page

Certification Registry Verification

Vendor Commits to Not Training on Customer Data

AI Data Usage Policy

AI Data Retention Policy Not Specified

AI Data Usage Policy

Recommended Actions

Steps to address findings for Slack

  1. 1

    Request Slack's current SOC 2 Type II report and bridge letter — contact Slack's security team via their trust page at https://trust.slack.com or ask your account representative. Many enterprise customers receive this under NDA. Confirm the report covers the current period and review the scope, user entity controls (CUECs), and any exceptions noted by the auditor.

  2. 2

    Manually review the subprocessor page at https://slack.com/help/subprocessors and reconcile the current list against your organization's GDPR Article 28 DPA and third-party risk inventory. If your DPA is more than 12 months old, request an updated version from Slack's legal team.

  3. 3

    Confirm the AI opt-out status for your workspace: if your Slack environment handles sensitive or confidential communications, submit an opt-out request to feedback@slack.com with your workspace URL and subject line 'Slack Global model opt out,' and retain a copy of the confirmation as part of your vendor risk file.

  4. 4

    Evaluate the HTTP security header posture of app.slack.com (the application endpoint) separately from the marketing site — run a HTTP security scanner scan against app.slack.com to confirm whether the C+ grade observed on the marketing domain reflects the production application environment.

  5. 5

    Review your organization's endpoint security posture in the context of the November 2025 Nikkei incident: the breach was attributed to a malware-infected employee device accessing Slack, not a platform vulnerability. Confirm that your MDM/EDR controls enforce device health attestation before Slack access is permitted, and review your Slack session management policies (idle session timeouts, device trust requirements).

  6. 6

    Verify ISO 27001 certification status directly with Slack's security team — the IAF CertSearch registry did not return a result, but registry coverage is incomplete. Request a copy of the current ISO 27001 certificate (including issuing body and expiry date) and retain it in your vendor file.

Intelligence Sources Queried

26 sources in this assessment

24of 26 sources returned data
IP Reputation
AI Data Usage Policy
Threat Intelligence (OTX)
Adverse Media Scan
Certification Registry Verification
Domain Analysis
FDIC Institution Check
Business Registration
Historical Media Search
Tech Community Sentiment
Company Intelligence
Adverse Media Scan (Fallback)
HTTP Security Scan
Sanctions & Watchlist Screening
Malware & Phishing Check
SEC Filing Search
Infrastructure Exposure
SSL/TLS Analysis
Supply Chain & Subprocessor Discovery
Trust & Compliance Page Scan
Website Security Scan
Threat Intelligence
Web Archive History
Domain Registration
Certificate Transparency
Deep Document Analysis

Data Coverage Notes

Some data sources may have had limited availability during this assessment. This does not reflect negatively on the vendor.

  • The subprocessor page at slack.com was found but could not be automatically parsed due to likely JavaScript rendering — subprocessor data was supplemented with a 2022 policy archive and may not reflect Slack's current subprocessor relationships.
  • Certificate Transparency log data (Certificate Transparency service) was unavailable during this assessment; certificate information was derived from a direct TLS handshake only, limiting subdomain enumeration.
  • The trust page at trust.slack.com returned HTTP 200 responses but content could not be extracted automatically (likely JavaScript-rendered); certification claims on this page could not be independently confirmed beyond FedRAMP registry verification.
  • Web archive history data returned an anomalous result (first seen 2026-04-13) inconsistent with the WHOIS registration date of 1992 — this appears to be a provider-specific data gap and does not reflect the actual domain establishment history.
  • ISO 27001 certification status was not found in the IAF CertSearch registry during this assessment; this does not confirm absence of certification, as registry coverage is incomplete. Manual verification via Slack's trust page is recommended.
  • Questionnaire coverage was 0% (no auto-filled answers were returned from the questionnaire mapping layer), meaning all evidence in this report derives from external signal sources; vendor-attested responses were not available to supplement or contradict external findings.
183+
Vendors assessed
98%
Average confidence
<2 min
Time to report
What a ThirdProof assessment covers

Sanctions Screening

Is Slack on any OFAC, EU, or UN sanctions list? Are any officers or affiliates flagged?

Cyber Risk Assessment

What is Slack's security posture? Threat intelligence scanning, known vulnerabilities, and security header analysis.

Business Registration

Is Slack a legitimately registered business entity? Corporate status, jurisdiction, and officer verification.

Adverse Media Analysis

Has Slack appeared in negative news coverage? Data breaches, lawsuits, regulatory actions, and complaints.

Domain & Infrastructure

Is Slack's website secure? TLS configuration, DNS hygiene, security headers, and domain age analysis.

Company Intelligence

What are Slack's firmographics? Employee count, industry classification, technology stack, and corporate structure.

Trust & Compliance Verification

Does Slack claim SOC 2, ISO 27001, HITRUST, or FedRAMP? ThirdProof scans trust pages for certification claims and cross-references the FedRAMP public registry for independent verification.

Supply Chain & Subprocessor Discovery

Who does Slack depend on? ThirdProof discovers subprocessors from vendor-published pages and runs sanctions screening and safe browsing checks against each one.

Regulatory & Financial Filings

Has Slack appeared in SEC enforcement filings? Is it associated with any FDIC bank failures? ThirdProof searches regulatory databases with entity verification to confirm attribution.

Full methodology, rule engine, and AI disclosure: /methodology

Slack Enterprise Compliance Context

Slack (now part of Salesforce) processes internal communications, file sharing, and integration data that often includes sensitive business information. Slack claims SOC 2, FedRAMP, HIPAA, GDPR, and CCPA compliance. Since the Salesforce acquisition, Slack's security program benefits from Salesforce's enterprise compliance infrastructure, but organizations should verify certification scope independently. For organizations also evaluating Salesforce products, consider assessing both vendors holistically to understand shared compliance boundaries.

Slack Security Posture

ThirdProof investigated Slack across 27 intelligence sources. Domain reputation is clean across 94 security engines with a 33-year domain history. Sanctions screening returned clear with no matches. No malware, phishing indicators, or IP reputation issues were detected. The HTTP security grade of C+ (60/100) reflects header configuration gaps that are common in complex enterprise applications but should be documented in your vendor risk register.

Seeing this in an audit? ThirdProof lets you investigate Slack and every other vendor in your stack — average report time: 7 minutes. Get Slack's Full Report Free →

Frequently asked about Slack

Is Slack FedRAMP authorized?+
Slack is not currently listed on the FedRAMP Marketplace as of April 2026.
Does Slack have SOC 2 Type II?+
Yes — Slack holds SOC 2 (Type II not confirmed). Rated Moderate Risk — subprocessor list unavailable. See all 5 findings →
Is Slack on the OFAC sanctions list?+
Slack returned no matches in ThirdProof's OFAC SDN, EU Consolidated, and UN sanctions screening as of April 2026.
What is Slack's vendor risk tier?+
ThirdProof assigned Slack a risk tier of Moderate Risk with 100% confidence based on assessment across 27 intelligence sources as of April 2026.
Does Slack have SOC 2 certification?+
ThirdProof's assessment found that Slack claims SOC 2, FedRAMP, HIPAA, GDPR, and CCPA compliance. Since Salesforce's acquisition of Slack, Slack's compliance program is integrated with Salesforce's enterprise security framework. Organizations should request Slack's current SOC 2 Type II report directly and verify that the scope covers the specific Slack services and data types relevant to your use case.
Is Slack safe for regulated industries?+
ThirdProof investigated Slack across 27 intelligence sources and assigned a Moderate Risk (Tier 3) rating with 80% confidence. Sanctions screening is clear, domain reputation is clean across 94 security engines, and Slack claims SOC 2, HIPAA, and FedRAMP compliance. The Moderate Risk rating reflects factors beyond pure security posture — run a free assessment to see the full risk breakdown.
Can I get an auto-filled security questionnaire for Slack?+
Yes. Every ThirdProof investigation of Slack produces two deliverables: an audit-ready risk report and a 133-question security questionnaire pre-filled with evidence from 27 independent sources. The questionnaire is mapped to SIG, SOC 2, HIPAA, PCI DSS and 9 other frameworks — answered without sending Slack a single email or waiting for a vendor response.
Is Slack safe to use as a vendor?+
Slack is a communications vendor that handles organizational messages and collaboration data. Safety depends on their current security posture, certification status, and how they handle your specific data. ThirdProof automates this evaluation across 27 intelligence sources — sanctions databases (OFAC, EU, UN), business registration verification, adverse media scanning, and cyber risk assessment — producing a deterministic risk tier with confidence score plus an auto-filled security questionnaire. Run a free investigation to see Slack's full risk profile.
Does Slack have SOC 2 certification?+
Yes — Slack holds SOC 2 + 6 other certs. Rated Moderate Risk — subprocessor list unavailable. See all 5 findings →
Has Slack had any data breaches?+
Data breach history is an important signal for any vendor, particularly communications platforms like Slack that handle organizational messages and collaboration data. ThirdProof's adverse media analysis searches multiple news APIs and public records for data breaches, security incidents, lawsuits, regulatory enforcement actions, and financial distress signals. Each finding is linked to its original source with severity classification.
Is Slack on any sanctions lists?+
Sanctions screening is standard due diligence for communications vendors. ThirdProof screens Slack against OFAC SDN, consolidated international sanctions lists, and PEP databases. The screening uses entity name verification to reduce false positives. If Slack or any associated officers appear on a sanctions list, this triggers automatic escalation to the highest risk tier.
How do I assess Slack for vendor risk?+
Assessing Slack as a communications vendor involves verifying SOC 2, HIPAA BAA availability, and FedRAMP compliance, reviewing their subprocessor chain, and checking sanctions exposure. ThirdProof automates this across 27 intelligence sources in an average of 7 minutes — no questionnaires or vendor participation required. Your first 5 investigations are free.
How long does a ThirdProof assessment take?+
A ThirdProof assessment completes in an average of 7 minutes. 27 intelligence sources are queried in parallel — sanctions databases, business registries, threat intelligence feeds, certificate transparency logs, and more. The result is a deterministic risk tier with confidence score and audit-ready PDF report.
Is ThirdProof free?+
ThirdProof offers 5 free vendor assessments with no credit card required. Each assessment includes the full report — risk tier, confidence score, individual findings, executive summary, and PDF export. Paid plans start at $399/month for teams that need ongoing vendor monitoring.
Can I use a ThirdProof report as SOC 2 audit evidence?+
Yes. ThirdProof reports are designed to satisfy SOC 2 CC9.2 (vendor risk management) requirements. Each report includes SHA-256 integrity verification, methodology disclosure, source attribution for every finding, and AI content labeling. Auditors can independently verify the report's authenticity and trace each finding to its original source.
How is ThirdProof different from a security questionnaire?+
Security questionnaires require vendor participation, take weeks, and produce self-reported answers. ThirdProof queries 27 independent intelligence sources — no vendor involvement needed. Risk tiers are assigned by a deterministic rules engine (not AI opinion), and every finding links to its original source. You get an audit-ready report in an average of 7 minutes instead of waiting weeks for a questionnaire response.

Slack is in your vendor stack. Can you prove you assessed them?

SOC 2 CC9.2, HIPAA, PCI-DSS, and CMMC all require documented vendor due diligence — not just knowing the answer, but having audit-ready evidence you verified it. Most compliance teams can't produce that documentation on demand.

ThirdProof investigates Slack across 27 intelligence sources in an average of 7 minutes — sanctions screening, cyber posture, SOC 2 verification, FedRAMP status, and more. Every investigation produces two deliverables: an audit-ready risk report and an auto-filled security questionnaire your prospects and auditors expect to see.

✓ 5 free investigations✓ Risk report + auto-filled questionnaire✓ No credit card required✓ Average report time: 7 minutes

Replaces $600–$900 in manual compliance consulting time per vendor assessed.