CVE-2025-34291
CVSS v3
8.8
HIGH
EPSS Score
14.0 %
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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.
CISA Known Exploited Vulnerability
- Date Added
- 2026-05-21
- Patch Due Date
- 2026-06-04
- Ransomware Use
- Unknown
Technical details
- Published
- 2025-12-05
Frequently asked questions
What is CVE-2025-34291?
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.
Is CVE-2025-34291 actively exploited?
Yes. CVE-2025-34291 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 6/4/2026.
What is the CVSS score for CVE-2025-34291?
CVE-2025-34291 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2025-34291 affecting your environment?
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