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CVE-2026-55255

Langflow Authorization Bypass Through User-Controlled Key Vulnerability

Langflow Langflow CWE-639

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.

CVSS Score
8.4
High
EPSS — Exploit Probability
0.9%
Riskier than 58% of all CVEs · checked 2026-09-20
Exploitation
Confirmed in the wild
KEV since 2026-07-07
Remediation
Patch available
Federal deadline 2026-07-10
CISA required action

Apply 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. Deadline for federal agencies: 2026-07-10.

NVD entry Vendor patch PoC / advisory CISA KEV

12 articles across 5 outlets · first covered Jun 26, 2026 · latest Jul 13, 2026

Coverage timeline

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