CVE-2026-55255

high

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://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited

https://www.securityweek.com/cisa-urges-immediate-patching-of-exploited-coldfusion-langflow-joomla-flaws/

https://www.helpnetsecurity.com/2026/07/08/langflow-vulnerability-cve-2026-55255-exploited/

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-prioritize-patching-langflow-auth-bypass-flaw/

https://thehackernews.com/2026/07/cisa-adds-4-actively-exploited-adobe.html

https://securityaffairs.com/194927/hacking/u-s-cisa-adds-adobe-coldfusion-joomlack-page-builder-langflow-and-joomshaper-sp-page-builder-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/07/07/cisa-adds-three-known-exploited-vulnerabilities-catalog

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255

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

Details

Source: Mitre, NVD

Published: 2026-06-23

Updated: 2026-07-08

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:P

Severity: Medium

CVSS v3

Base Score: 8.4

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

Severity: High

EPSS

EPSS: 0.00236