CVE-2026-56273 Flowise CVE debrief

Who should care

Users of Flowise before version 3.1.0, operators, platform administrators, vulnerability management teams, and security teams should be aware of this vulnerability and take steps to mitigate it. They should review the official advisory, assess their exposure, and plan updates or mitigations.

Technical summary

The vulnerability exists in the Faiss and SimpleStore vector store implementations of Flowise, allowing attackers with valid API tokens to write vector store data to arbitrary filesystem locations, potentially enabling code execution or data exfiltration. This could lead to code execution or data exfiltration if exploited. The vulnerability is considered Medium priority due to its CVSS score of 4.9.

Defensive priority

Medium priority due to the CVSS score of 4.9 and the potential impact of code execution or data exfiltration.

Recommended defensive actions

• Update Flowise to version 3.1.0 or later
• Restrict access to the API tokens
• Monitor for suspicious activity
• Implement additional security measures such as input validation and sanitization
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-07-08T14:17:15.800Z and was last modified on 2026-07-09T15:16:37.727Z. The NVD entry is currently Deferred. Evidence is limited to CVE and NVD details. Defenders should verify affected product deployments, review official advisories, and plan updates or mitigations. They should also review compensating controls, check monitoring and logs, and track exceptions.

Official resources