By the StackPick Editorial Team · Updated June 2026 · Researched from authoritative sources. General information, not professional advice.
You don't need to be a security engineer to ask a SaaS vendor the right questions. When you hand a tool your customer list, your invoices, or your team's documents, you're trusting that vendor with data you're legally and reputationally responsible for. This is a practical buyer's checklist: what to look for, why it matters, and how to verify it before you sign. It is not a deep infosec audit, and none of it replaces advice from your own legal or security advisors.
Any vendor can call itself "enterprise-grade" and "bank-level secure." Those phrases mean nothing on their own. What carries weight is a third party verifying the vendor's controls. The two most common attestations for SaaS are:
For health, finance, or government data you may also see HITRUST or FedRAMP. The key move: ask for the actual report, not a logo. Most vendors will share a SOC 2 report under a non-disclosure agreement (NDA). Email their sales or security contact: "Can you share your most recent SOC 2 Type II report under NDA?" A vendor that has one will have a smooth process for this. Hesitation or a vague answer is itself a signal. When you get the report, check the date (is it current?), the scope (does it cover the product you're buying?), and the auditor's exceptions section.
Use this table as a working list when comparing two or three finalists. You won't be able to verify everything yourself—and you don't need to—but you should be able to get a clear answer to each row.
| What to check | Why it matters | How to verify |
|---|---|---|
| Encryption in transit (TLS) | Stops data being intercepted between your browser and the vendor. | Confirm the app uses HTTPS/TLS everywhere; ask which TLS version. Look for it in the security/trust page. |
| Encryption at rest | Protects stored data if disks or backups are exposed. | Ask whether data at rest is encrypted (e.g., AES-256) and whether you can use your own keys. |
| SSO / SAML and MFA | Lets you centralize logins and enforce multi-factor authentication. | Check whether SSO is available on your plan tier and whether MFA can be required for all users. |
| Role-based access control | Limits who inside the tool can see or change sensitive data. | Ask for the list of roles/permissions and whether you can create custom roles. |
| Audit logs | Lets you see who did what—essential after an incident. | Confirm admin/audit logs exist and can be exported or streamed to your tools. |
| Data export & deletion | Prevents lock-in and supports privacy obligations. | Test the export yourself during a trial; read the deletion terms in the contract. |
| Sub-processors & residency | Reveals who else touches your data and where it lives. | Find the sub-processor list (often on the trust page); confirm hosting regions. |
| Uptime SLA & status page | Sets expectations for availability and transparency. | Read the SLA percentage and credits; subscribe to the public status page. |
| Backups & disaster recovery | Determines how fast you'd recover after an outage or loss. | Ask for the RTO and RPO targets in writing. |
| Breach notification | Defines whether and how fast you'd be told of an incident. | Check the DPA for a notification window (e.g., "without undue delay"). |
Two layers of encryption matter. In transit means data is protected by TLS as it travels between your device and the vendor's servers—the padlock in your browser. At rest means the stored data is encrypted on the vendor's disks and backups. You want both. You don't need to evaluate the cryptography itself; you just need confirmation that both exist.
Access control is where most everyday risk actually lives, because breaches more often come from stolen logins than broken math. Look for single sign-on (SSO) via SAML so your team logs in through one identity provider, the ability to require multi-factor authentication (MFA), role-based access so a junior user can't export the whole database, and audit logs so you can reconstruct events later. Apply the principle of least privilege: give each person and each integration the minimum access it needs.
When you connect a SaaS tool to your email, calendar, or file storage, it asks for OAuth scopes—specific permissions. A note-taking app that requests full read/write access to your entire inbox is asking for far more than its job requires. Read the consent screen before clicking "Allow," prefer tools that request narrow scopes, and periodically review and revoke connected apps you no longer use. Least privilege applies to machines as much as to people.
Contracts decide what actually happens to your data, so don't skip the legal layer. Confirm in writing that you own your data, that you can export it in a usable format at any time, and that the vendor will delete it on request and at the end of the contract. Then read the Data Processing Agreement (DPA)—the document that governs how the vendor processes data on your behalf.
The DPA is also where breach-notification commitments and the sub-processor list usually live. Check both: a vendor that lists its sub-processors and promises to notify you of changes is being transparent about who else touches your data.
Security and reliability overlap. Read the uptime SLA and understand what the credits actually compensate (they rarely cover your real losses, but the number signals confidence). Subscribe to the vendor's public status page so you learn about outages from the source, not from angry users. Ask about backup frequency and disaster recovery, expressed as RTO (how long until service is restored) and RPO (how much data could be lost). Finally, look at incident history: search for past breaches, read how the vendor communicated, and check whether it publishes post-incident reviews. A vendor that handled a past incident openly is often safer than one with no public track record at all.
Many vendors maintain a "trust center" or security page that consolidates certifications, sub-processors, status, and policies—a good first stop. For higher-stakes purchases, send a short security questionnaire covering the rows in the table above; you don't need a 300-question enterprise template. If your tool is custom or developer-facing, it's reasonable to ask whether the vendor tests against the OWASP Top 10 (the widely used list of common web-application risks) and whether they run regular penetration tests. You're not auditing the results—you're confirming the practice exists.
For low-risk tools, seeing that a current SOC 2 Type II exists is often enough. For anything touching customer or financial data, request the report under NDA and at least check its date, scope, and the auditor's exceptions. The badge tells you a report exists; the report tells you what it actually covers.
Not automatically. Small or early-stage vendors may not have completed a formal audit yet. In that case, lean harder on the other checks—encryption, MFA, a clear DPA, data export, and a published security page—and weigh the sensitivity of the data you'd store there. Avoid placing regulated data (health, payment, sensitive personal data) with an unaudited vendor.
Access controls plus data export. Being able to require MFA, limit roles, and pull your data out at any time covers the most common real-world risks—account takeover and vendor lock-in—without requiring deep security expertise.
Review your critical vendors roughly once a year, and any time they change ownership, pricing tiers, or sub-processors. Re-confirm the certification is still current, re-read the DPA if it changed, and audit which integrations and OAuth permissions are still active.
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