CVE-2025-34291

HIGH8.8

CISA KEV

Published 2025-12-05 · Updated 2026-10-15 · Source disclosure@vulncheck.com

Summary

CVE-2025-34291 is a high-severity (CVSS 8.8) vulnerability in Langflow Langflow. CISA added it to the Known Exploited Vulnerabilities catalog on May 21, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by June 4, 2026. CISA does not currently list it as used in ransomware campaigns. Langflow has 5 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 5 known-exploited Langflow vulnerabilities →

Description

Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-346

CISA Known-Exploited Vulnerability

Product: Langflow — Langflow

Name: Langflow Origin Validation Error Vulnerability

Date added: 2026-05-21 · Due: 2026-06-04

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited Langflow vulnerabilities

Most recently added to CISA KEV

CVE-2026-0770
Langflow — Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability
added 2026-07-21
CVE-2026-55255
Langflow — Langflow Authorization Bypass Through User-Controlled Key Vulnerability
added 2026-07-07
CVE-2026-33017
Langflow — Langflow Code Injection Vulnerability
added 2026-03-25
CVE-2025-3248
RANSOMWARE
Langflow — Langflow Missing Authentication Vulnerability
added 2025-05-05

View all →

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