CVE-2026-55255
- EPSS 0.56%
- Published 23.06.2026 16:28:20
- Last modified 08.07.2026 13:39:12
- CVE watchlists
- Open
LoginLangflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow
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.
07.07.2026: CISA Known Exploited Vulnerabilities (KEV) Catalog
Langflow Authorization Bypass Through User-Controlled Key Vulnerability
VulnerabilityLangflow 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.
DescriptionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Required actions| Type | Source | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.56% | 0.427 |
| Source | Base Score | Exploit Score | Impact Score | Vector string |
|---|---|---|---|---|
| security-advisories@github.com | 8.4 | 1.8 | 6 |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
|
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.