CVE-2025-34291
high CISA KEVLangflow Origin Validation Error Vulnerability
Vendor / product: Langflow — Langflow
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/langflow-ai/langflow disclosure@vulncheck.com
- https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vul... disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rc... disclosure@vulncheck.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://www.crowdsec.net/vulntracking-report/cve-2025-34291 134c704f-9b21-4f2e-91b3-4a467353bcc0