CVE-2026-55255

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.

Affected Software

Weaknesses

• CWE-639: CWE-639: Authorization Bypass Through User-Controlled Key

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: active
  • Automatable: no
  • Technical Impact: total

Additional References

• 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

References

• https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
• https://github.com/langflow-ai/langflow/pull/12832
• https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e

• ←Previous
• Next→