MSRXCVE-2025-34291
CVE-2025-34291
Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVSS 4.0 · CNA
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
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.
Affected packages and fixed versions
| Package | Ecosystem | Fixed in |
|---|---|---|
| langflow | PyPI | 1.7.0 |
Affected products
- Langflow Langflow: 0 to ≤ 1.6.9
Weakness: CWE-346
Also known as: GHSA-577h-p2hh-v4mv, PYSEC-2025-78
3 references (advisories, patches, write-ups)
- https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform · technical-description, exploit
- https://github.com/langflow-ai/langflow · product
- https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce · third-party-advisory
Sources: CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.