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Servers and applications

CVE-2025-34291

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…

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 21 May 2026.

Severity
Critical 9.4
Published
5 Dec 2025
Last changed
15 Oct 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
LangflowServers and applications · cpe:a:langflow:langflow
  • Every version up to 1.6.9

Known exploited

CISA name
Langflow Origin Validation Error Vulnerability
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.
Due for US agencies
4 Jun 2026
Used in ransomware
Not known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-34291
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-34291