Why Standard Security Questionnaires Miss Messaging-Specific Risks
Enterprise InfoSec teams have standard vendor security questionnaires — typically based on SIG (Standardized Information Gathering), CAIQ (Consensus Assessment Initiative Questionnaire), or internal templates. These questionnaires are designed for general SaaS vendors and cover important foundational security topics: data encryption, access controls, incident response, vulnerability management.
But they systematically miss the security characteristics that are most relevant for messaging integration vendors specifically. A messaging bridge vendor that scores well on a generic SIG questionnaire can still have serious security gaps that only appear when you ask the right messaging-specific questions.
This questionnaire fills that gap.
Domain 1: Data Processing Architecture (6 questions)
Q1: Does your platform store message content at rest?
Why it matters: The most critical architectural question for a messaging bridge. A vendor that stores message content has a data liability that grows with every message routed. A vendor with a zero-storage, in-memory routing model eliminates this risk entirely.
Red flag answer: "We store messages for X days to support retry delivery." This means your corporate communications are at rest in a third-party system.
Green flag answer: "Message content is processed exclusively in-memory and never persisted to disk or database. Routing metadata (platform IDs, timestamps) is logged; message content is not."
Q2: What data does your audit log capture?
Why it matters: The audit log is the system of record for all activity through the bridge. You need to understand what it contains — and what it does not.
Red flag answer: Vague or no answer. Or: "We log everything, including message previews."
Green flag answer: "The audit log captures source platform, destination platform, channel identifiers, message IDs, routing timestamps, and configuration version. Message content is not logged."
Q3: What is the retention period for routing logs?
Why it matters: Retention periods affect both compliance (you may need records for a specific period) and risk (longer retention = more data liability if the log is compromised).
Green flag answer: Configurable retention with a defined default (e.g., 90 days) and the ability to extend for compliance requirements.
Q4: Where is processing infrastructure hosted? What regions?
Why it matters: Data sovereignty, GDPR Article 44-49 transfers, and operational latency all depend on geography.
Green flag answer: Multi-region deployment with EU-only processing option for GDPR compliance.
Q5: What is your subprocessor list?
Why it matters: The bridge vendor's SOC 2 certification covers their own infrastructure. Their subprocessors (cloud providers, CDN, logging services) may have different security postures.
Green flag answer: A documented subprocessor list with links to each subprocessor's compliance certifications, available upon request.
Q6: Do you have a data retention and destruction policy for customer data at contract termination?
Why it matters: HIPAA and GDPR require documented data destruction at the end of a vendor relationship.
Domain 2: Access Control and Authentication (5 questions)
Q7: What OAuth scopes does your platform request during integration setup?
Why it matters: Overly broad OAuth scopes are a common security risk. A messaging bridge that requests channels:history on your entire Slack workspace has read access to all historical messages — far broader than necessary.
Green flag answer: Scopes are limited to the specific channels being bridged, not organization-wide access.
Q8: Are OAuth credentials stored in encrypted vaults? What encryption standard?
Green flag answer: AES-256 encryption at rest, with a HSM or KMS-managed key hierarchy.
Q9: What is your process for OAuth token rotation?
Why it matters: Long-lived tokens are a persistent security risk. Regular rotation limits the blast radius if a token is compromised.
Green flag answer: Automatic token refresh on expiry; manual rotation available at any time via the admin console.
Q10: Do you support SSO for admin console access?
Green flag answer: SAML 2.0 and OIDC support for SSO. Password-only admin access should be avoidable.
Q11: Is RBAC available for bridge configuration?
Why it matters: The principle of least privilege should apply to the bridge admin console. Not every IT admin should have the ability to create, modify, or delete bridge configurations.
Green flag answer: Granular RBAC with at minimum Admin, Editor, and Viewer roles.
Domain 3: Network and Infrastructure Security (4 questions)
Q12: What TLS version is used for API communications?
Green flag answer: TLS 1.3 required; TLS 1.2 as a fallback minimum; TLS 1.0 and 1.1 disabled.
Q13: Do you use a WAF (Web Application Firewall)?
Q14: How are webhook endpoints protected against abuse or DDoS?
Why it matters: Your messaging bridge's webhook endpoints receive events from Slack, Teams, Zoom, etc. An attacker who can send fake events to these endpoints could potentially inject messages.
Green flag answer: Webhook signature validation on all inbound events; rate limiting on endpoints; IP allowlisting support for platforms that publish webhook source IP ranges.
Q15: Do you perform penetration testing? How frequently? Is the report available?
Green flag answer: Annual third-party penetration test with a report available under NDA.
Domain 4: Compliance Certifications (4 questions)
Q16: What is the observation period and scope of your SOC 2 Type II certification?
Why it matters: See the guide on SOC 2 interpretation — scope and recency both matter.
Q17: Are HIPAA BAAs available? On which plans?
Q18: Do you support GDPR compliance requirements (DPA, data residency, subject rights)?
Q19: Are you FedRAMP authorized or in process?
Why it matters: Required for US federal government and many state/local government agencies.
Domain 5: Incident Response (4 questions)
Q20: What is your SLA for notifying customers of a security incident?
Green flag answer: 72 hours or less (aligned with GDPR's 72-hour breach notification requirement).
Q21: What is your incident response process when a customer's data is affected?
Q22: Can you provide your most recent incident response test or tabletop exercise report?
Q23: Do you carry cyber liability insurance? What is the coverage amount?
Domain 6: Vendor Risk (5 questions)
Q24: What is your organizational continuity plan if you are acquired?
Why it matters: A messaging bridge deeply embedded in enterprise infrastructure creates vendor lock-in risk. If the vendor is acquired and the product is sunset, the enterprise has a critical infrastructure dependency with no continuity plan.
Q25: What is your engineering team's security training program?
Q26: Do you have a bug bounty program?
Q27: What is your software supply chain security practice (SBOM, dependency scanning)?
Q28: What is your vulnerability disclosure policy and SLA for patching critical CVEs?
Green flag answer: Critical CVEs patched within 48–72 hours, with customer notification.
Download this questionnaire as a PDF template → | Request SyncRivo's completed security questionnaire →
