Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | <= 1.6.9 |
Related Weaknesses (CWE)
References
- https://github.com/langflow-ai/langflowProduct
- https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-aExploitMitigationThird Party Advisory
- https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-
- https://www.crowdsec.net/vulntracking-report/cve-2025-34291
FAQ
What is CVE-2025-34291?
CVE-2025-34291 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 all...
How severe is CVE-2025-34291?
CVE-2025-34291 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-34291?
Check the references section above for vendor advisories and patch information. Affected products include: Langflow Langflow.