CVE-2026-56269 Flowise CVE debrief

Who should care

Defenders managing Flowise deployments, especially in environments where user and workspace identifiers are sensitive, should assess exposure and prioritize verification and monitoring.

Why it matters

CVE-2026-56269 is a medium-severity vulnerability in Flowise that allows decryption of sensitive metadata in JWT tokens due to a weak hardcoded secret. Defenders should verify Flowise deployments, especially in sensitive environments, and monitor for unusual activity.

• Decrypting internal user and workspace identifiers
• Potential metadata manipulation aiding privilege escalation
• Possible unauthorized data access through manipulated identifiers
• Verification of Flowise version and configuration

Technical summary

Flowise before version 3.1.0 uses a weak hardcoded default value 'Secre$t' for the TOKEN_HASH_SECRET environment variable. This secret is used to derive the AES-256-CBC key for encrypting user IDs and workspace IDs in JWT tokens. An attacker knowing this default secret can decrypt metadata to extract internal identifiers and potentially re-encrypt manipulated values. Defenders should prioritize verifying Flowise deployments for version 3.1.0 or later, especially in environments where user and workspace identifiers are sensitive. Inventory checks and monitoring for unusual metadata changes are recommended.

Defensive priority

Defenders should prioritize verifying Flowise deployments for version 3.1.0 or later, especially in environments where user and workspace identifiers are sensitive. Inventory checks and monitoring for unusual metadata changes are recommended.

Recommended defensive actions

• Verify Flowise deployments for version 3.1.0 or later
• Inventory checks for affected versions
• Monitor for unusual metadata changes
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. Vendor advisories and third-party analyses offer additional context and mitigation strategies.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.