CVE catalog
CVE-2026-55255
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 authenti
- Severity
- High · CVSS 8.4
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L - Published
- Source
- [NVD] · [CVE record]
- Exploitation
- CISA Known Exploited Vulnerabilities
- EPSS
- 0.89% · Oct 25, 2026
Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | langflow | Not reported | 1.9.1 | fixed |
| Cpe | langflow | Not reported | 1.9.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | langflow | cpe | Not reported | 1.9.1 | Not reported | Not reported | Not reported |
| Cpe | langflow | cpe | Not reported | 1.9.1 | Not reported | NVD-CVE-2026-55255 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/langflow-ai/langflow/commit/2c9f498d664a3c32698b57d7c5e752625291060e]
- [https://github.com/langflow-ai/langflow/pull/12832]
- [https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55255]
- [https://webflow.sysdig.com/blog/understanding-langflow-cve-2026-55255-and-why-higher-cvss-vulnerabilities-arent-always-the-most-exploited]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2030.json]
- [https://www.cisa.gov/known-exploited-vulnerabilities-catalog]
- [https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255]
[CERT-Bund public advisories] · [CISA Known Exploited Vulnerabilities (OSINT)] · [FIRST EPSS] · [National Vulnerability Database (NVD)]