How to Evaluate SaaS Vendor Security

Before diving into vendor-specific evaluation, establish your minimum security baseline. Any SaaS vendor handling your organization's data should meet these requirements:

Encryption. Data encrypted in transit (TLS 1.2 or higher) and at rest (AES-256 or equivalent). This is non-negotiable in 2026. If a vendor does not encrypt data at rest, they should not be considered for any use case involving sensitive data. You can verify TLS configuration using public tools — ThirdProof checks this automatically during assessment.

Authentication. SSO (SAML 2.0 or OIDC) support for enterprise plans. MFA enforcement for all users, especially administrators. SCIM provisioning for automated user lifecycle management. Vendors that do not support SSO force employees to create separate credentials, increasing password reuse risk and making offboarding unreliable.

Access controls. Role-based access controls (RBAC) with the ability to assign granular permissions. Admin audit logging showing who accessed what, when. The ability to restrict access by IP range or network for sensitive environments.

Incident response. A documented incident response plan. Defined breach notification timelines (72 hours or less to customers). A security contact or team that can be reached during an active incident. Status page with historical uptime data.

Compliance evidence. At minimum, a SOC 2 Type II report. Additional certifications (ISO 27001, HITRUST, PCI DSS) depending on your data sensitivity and regulatory requirements. See our guide on how to verify SOC 2 compliance for what to look for.

These signals should raise immediate concerns during vendor evaluation:

No SOC 2 report available. A SaaS vendor in 2026 without a SOC 2 report either has not invested in security maturity or cannot pass the examination. For vendors handling any sensitive data, this is a significant concern. Some early-stage startups are genuinely pre-SOC 2 — if so, ask when they plan to complete it and what controls they have in place today.

SSO as a premium upsell. Vendors that gate SSO behind enterprise pricing tiers are creating a security tax — they are making it more expensive for customers to be secure. This practice is declining but still common. It indicates that the vendor views security as a revenue feature rather than a baseline requirement.

Vague security pages. A security page that says "we take security seriously" without specifics is a marketing page, not a security disclosure. Look for: specific certifications listed (with dates), a security whitepaper or architecture document, a vulnerability disclosure policy, and a security contact email. Vague language without specific commitments is a red flag.

No breach notification terms. If the vendor's terms of service do not address breach notification, or if notification timelines exceed 72 hours, the vendor may not have a mature incident response program. Your contract should specify notification timelines, the information to be provided, and remediation responsibilities.

Resistance to security questions. Legitimate vendors expect and welcome security questions from enterprise customers. Vendors that are evasive, dismissive, or unresponsive to security inquiries may be hiding deficiencies. An inability to answer basic security questions ("where is our data hosted?") is disqualifying.

No subprocessor transparency. If a vendor cannot or will not tell you who processes your data downstream, you cannot assess fourth-party risk. Subprocessor transparency is a baseline expectation.

When choosing between competing SaaS vendors, security should be a weighted evaluation criterion alongside functionality, price, and user experience. Here is how to structure the comparison:

Create a security scorecard. Rate each vendor across key dimensions: encryption (in transit + at rest), authentication (SSO, MFA, SCIM), access controls (RBAC, audit logs), compliance certifications (SOC 2, ISO 27001), breach history (known incidents, response quality), and infrastructure (hosting, architecture, redundancy). Weight each dimension based on your data sensitivity.

Use independent evidence. Vendor sales teams will claim their product is secure. Independent assessment provides the verification layer. ThirdProof evaluates vendors across 27 intelligence sources, producing a risk tier and confidence score that you can compare directly across vendors. Run assessments on your shortlisted vendors to get an apples-to-apples security comparison.

Evaluate the security roadmap. A vendor that currently lacks certain security features but has a concrete roadmap (e.g., "SOC 2 examination begins Q3, SSO available in Q4") is different from a vendor that has no plans to address gaps. Ask about their security roadmap and hold them to committed timelines.

Check vendor security in context. A project management tool handling task descriptions has different security requirements than a CRM handling customer PII. Evaluate security relative to the data sensitivity and business criticality of the specific use case. Notion and Monday may have similar security postures, but the one hosting your customer database needs deeper scrutiny than the one managing internal task boards.

Step 1: Define your requirements. Before evaluating any vendor, document what data will be stored in the application, who will have access, what compliance frameworks apply, and what your minimum security baseline is. This prevents scope creep during evaluation and ensures consistent assessment across vendor candidates.

Step 2: Run independent assessment. Start with ThirdProof or equivalent independent assessment to establish the evidence baseline. This gives you objective security posture data before you engage the vendor's sales team. The assessment covers sanctions screening, security posture, compliance verification, and breach history — all without requiring vendor cooperation.

Step 3: Review vendor documentation. Read the vendor's security whitepaper, trust page, privacy policy, and terms of service. Compare marketing claims against what the independent assessment found. Note any discrepancies between what the vendor claims and what can be independently verified.

Step 4: Conduct targeted follow-up. Based on the independent assessment and documentation review, prepare a short list (10-15 items) of specific questions for the vendor. Focus on gaps identified during assessment — not generic questionnaire questions. This is the alternative to the 300-question questionnaire that provides better information in less time.

Step 5: Document your decision. Regardless of whether you approve or reject the vendor, document your assessment findings, rationale, and any conditions for approval. This documentation satisfies SOC 2 CC9.2 requirements and provides an audit trail for compliance reviews.

Step 6: Establish monitoring. Once approved, add the vendor to your monitoring schedule. Set reassessment dates, subscribe to the vendor's security advisories, and monitor for adverse events. Security evaluation is not a one-time activity — it is an ongoing process.

Different SaaS categories present different security considerations:

Productivity and collaboration tools (Notion, Asana, Monday, ClickUp). Primary concerns: data classification (sensitive documents in shared workspaces), access controls (guest permissions, external sharing), and data portability (can you export everything if you leave?). These tools often contain more sensitive data than organizations realize — internal strategy documents, financial projections, and customer information.

Design and creative tools (Figma). Primary concerns: intellectual property protection (design files, brand assets), collaboration security (external contributor access), and file storage location. Design tools may contain pre-release product information and proprietary visual assets.

Developer tools. Primary concerns: code repository security, CI/CD pipeline integrity, secrets management, and dependency supply chain risk. Developer tools have elevated risk because they touch your codebase and deployment infrastructure directly.

Communication tools. Primary concerns: message retention and discovery (legal hold capabilities), encryption (end-to-end vs. in-transit only), and integration security (third-party apps with message access). Communication tools contain sensitive internal discussions that may be subject to legal discovery.

For each category, the baseline requirements remain the same (encryption, authentication, access controls, compliance evidence), but the emphasis shifts based on the specific data types and use patterns involved.