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Vulnerabilities CVE-2025-34291

CVE-2025-34291

Critical
Open
KEV
TLP:CLEAR

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

AI Analysis

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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.

Details

CVSS Score
9.4
EPSS Score
83.84%

99.7th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Confidence
100%
Published
Dec 5, 2025
Last Modified
May 22, 2026
CISA KEV
Date Added
May 21, 2026
Patch Due
Jun 4, 2026
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.
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