CVE-2026-55255

Description

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.

References

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• https://nvd.nist.gov/vuln/detail/CVE-2026-55255
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
• https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
• https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
• https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38517
• https://github.com/langflow-ai/langflow/pull/12832
• https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e