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.

Proof of Concept (POC) Links

Explore how this vulnerability can be reproduced or exploited.

https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2 https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2 https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255