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.
Advisories

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Fixes

Solution

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Workaround

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History

Tue, 09 Dec 2025 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Langflow
Langflow langflow
Vendors & Products Langflow
Langflow langflow

Mon, 08 Dec 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 05 Dec 2025 22:45:00 +0000

Type Values Removed Values Added
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.
Title Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Weaknesses CWE-346
References
Metrics cvssV4_0

{'score': 9.4, '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2025-12-08T20:46:49.653Z

Reserved: 2025-04-15T19:15:22.581Z

Link: CVE-2025-34291

cve-icon Vulnrichment

Updated: 2025-12-08T20:46:41.309Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-12-05T23:15:47.433

Modified: 2025-12-08T18:26:49.133

Link: CVE-2025-34291

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-12-08T09:39:54Z

Weaknesses