CVE-2025-34291
HIGHCVSS v3
8.8
HIGH
EPSS Score
14.0%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical Details
- Published
- 12/5/2025
Frequently Asked Questions
What is 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.
Is CVE-2025-34291 actively exploited?
Active exploitation of CVE-2025-34291 has not been confirmed. The EPSS score is 14.0%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-34291?
CVE-2025-34291 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2025-34291 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.