CVE-2025-34291—Langflow Origin Validation Error Vulnerability

Vulnerability Name

Langflow Origin Validation Error Vulnerability

Description

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

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.

Additional Notes

• This vulnerability could affect an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/langflow-ai/langflow
• https://github.com/langflow-ai/langflow/releases/tag/v1.9.3
• https://github.com/langflow-ai/langflow/issues/11465#event-25774545848
• https://nvd.nist.gov/vuln/detail/CVE-2025-34291

Related News Articles

• Langflow Vulnerability CVE-2026-5027 Exploited for Unauthenticated RCEJune 10, 2026
• Unpatched Langflow Flaw CVE-2026-5027 Exploited for Unauthenticated RCEJune 10, 2026
• CISA Adds Exploited Langflow and Trend Micro Apex One Vulnerabilities to KEVMay 22, 2026

Related Weaknesses

• CWE-346