CVE-2026-55255
Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
CVSS Score
8.4
EPSS Score
0.2%
EPSS Percentile
14th
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.
| CWE | CWE-639 |
| Vendor | langflow-ai |
| Product | langflow |
| Published | Jun 23, 2026 |
| Last Updated | Jul 8, 2026 |
⚠️ Actively Exploited — Act Now
Get instant alerts for langflow-ai langflow
This vulnerability is actively exploited in the wild. Set up free real-time alerts so you're first to know about threats like CVE-2026-55255.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low
Affected Versions
langflow-ai / langflow
< 1.9.1
References
github.com: https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2 github.com: https://github.com/langflow-ai/langflow/pull/12832 github.com: https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e webflow.sysdig.com: https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255