Summary
generated automatically from NVD dataLangflow, a tool for building and deploying AI-powered agents and workflows, has an Insecure Direct Object Reference (IDOR) flaw (CWE-639) in its /api/v1/responses endpoint in versions prior to 1.9.1. An authenticated attacker can run any flow owned by another user simply by supplying the victim's flow ID in the request. The issue is rated HIGH with a CVSS v3.1 score of 8.4, is listed in the CISA KEV catalog, and is fixed in 1.9.1.
NVD 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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-07. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-10
EPSS · FIRST.org
0.89%probability of exploitation in the next 30 days
Higher than 58% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 23 juin 2026
- Updated
- 7 oct. 2026
- Status
- Analyzed
- Source
- security-advisories@github.com
Affected products
Weaknesses (CWE)
References (6)
- https://github.com/langflow-ai/langflow/pull/12832Issue TrackingPatch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2ExploitMitigationVendor Advisory
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2ExploitMitigationVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-55255US Government Resource
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