CVE-2025-34291
Langflow Origin Validation Error Vulnerability
Summary
Langflow contains an origin validation error vulnerability in which an overly permissive CORS configuration 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. This could allow the attacker to execute arbitrary code and achieve full system compromise via obtained tokens that permit access to authenticated endpoints.
Affected software
Vendor: Langflow · Product: Langflow
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Langflow
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2025-3248 | Langflow Missing Authentication Vulnerability | 100.0% | Yes |
| CVE-2026-33017 | Langflow Code Injection Vulnerability | 99.8% | Yes |
| CVE-2026-0770 | Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability | 53.5% | Yes |
| CVE-2026-55255 | Langflow Authorization Bypass Through User-Controlled Key Vulnerability | 29.1% | Yes |
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