CVE-2025-34291: Langflow CORS misconfiguration enables Account Takeover and RCE
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 (alloworigins='' with allowcredentials=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.
Published Dec 6, 2025 · Updated May 29, 2026
Affected packages
langflow
- Ecosystem
- PyPI
- Affected
- <= 1.6.9
- Fixed in
- 1.7.0
- Check
pip show langflow
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.
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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.
Credited to augustocesarperin.
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-34291
- https://github.com/langflow-ai/langflow
- https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform
- https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce
- https://github.com/langflow-ai/langflow/pull/10139
- https://github.com/langflow-ai/langflow/pull/10696
- https://github.com/langflow-ai/langflow/pull/9240
- https://github.com/langflow-ai/langflow/pull/9441
- https://github.com/pypa/advisory-database/tree/main/vulns/langflow/PYSEC-2025-78.yaml
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291
- https://www.crowdsec.net/vulntracking-report/cve-2025-34291
- https://github.com/advisories/GHSA-577h-p2hh-v4mv
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology
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