CVE-2025-34291

Known Exploited Vulnerability

Langflow Origin Validation Error Vulnerability

Vendor / product: Langflow / Langflow

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.

Weakness classification

• disclosure@vulncheck.com: CWE-346

Primary references

• disclosure@vulncheck.com — Product
• disclosure@vulncheck.com — Exploit, Mitigation, Third Party Advisory
• disclosure@vulncheck.com — Third Party Advisory
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — US Government Resource
• 134c704f-9b21-4f2e-91b3-4a467353bcc0 — Third Party Advisory