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 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.

Affected products

Langflow

Langflow

≤ 1.6.9

Fix

Available

CVSS 4.0

9.4 CRITICAL

CVSS 3.1

8.8 HIGH

EPSS

83.8% (100th percentile)

Weakness

CWE-346

NVD status

Analyzed

Published

2025-12-05

Attack patterns

CAPEC-160, CAPEC-21