CVE-2025-34291

UNKNOWN 0.0

⚠️ CISA KEV

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

CVSS Score

0.0

EPSS Score

9.5%

EPSS Percentile

93th

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.

CWE	CWE-346
Vendor	langflow
Product	langflow
Published	Dec 5, 2025
Last Updated	May 22, 2026

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Affected Versions

Langflow / Langflow

0 ≤ 1.6.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

obsidiansecurity.com: https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform github.com: https://github.com/langflow-ai/langflow vulncheck.com: https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce crowdsec.net: https://www.crowdsec.net/vulntracking-report/cve-2025-34291 cisa.gov: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291

Credits

Fenix Qiao (aka 13ph03nix) from Obsidian Security Shuyang Wang from Obsidian Security