ACTIVELY EXPLOITED
CVE-2025-34291: Langflow Origin Validation Error Vulnerability
| Vendor | Langflow |
|---|---|
| Product | Langflow |
| Actively exploited | Yes |
| Added to CISA KEV | 21 May 2026 |
| CISA federal deadline | 4 Jun 2026 |
| Weakness (CWE) | CWE-346 |
Required action (CISA's text)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description (NVD)
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.
SOURCES
Other Langflow flaws
- CVE-2026-0770: Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability
- CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability
- CVE-2026-33017: Langflow Code Injection Vulnerability
- CVE-2025-3248: Langflow Missing Authentication Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.