| Component | Langflow |
| Severity | high (CVSS 8.8) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Published (NVD) | 2025-12-05 |
| Last modified | 2026-10-08 |
| Affected versions | langflow <= 1.6.9 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-346 |
| CISA KEV | listed 2026-05-21 |
NVD 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.
CISA 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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep Langflow off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
- It is exploited in the wild: treat unpatched hosts as compromised, rotate the secrets they hold and review their logs.
Sources
- NVD: CVE-2025-34291
- 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://www.crowdsec.net/vulntracking-report/cve-2025-34291
- https://github.com/langflow-ai/langflow
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291
Read more
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