CVE-2026-55255
HIGH severity · CVSS 8.4 · Authorization bypass · actively exploited (CISA KEV)
8.4CVSS HIGH exploited
Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2026-07-07. US federal agencies must patch by 2026-07-10.
Summary
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactLow
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Affected products we track (1)
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Official patch: https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e ↗
Additional information
- NVD record
- https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060ePatch
- https://github.com/langflow-ai/langflow/pull/12832Patch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2Advisory
- https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploitedAdvisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255