CVE-2025-3248
Langflow Missing Authentication Vulnerability
Langflow Langflow
Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 5 May 2025. US federal agencies were required to remediate it by 26 May 2025. CISA records this vulnerability as known to be used in ransomware campaigns.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 100%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2025-3248 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2025-3248.
What does CVE-2025-3248 affect?
CVE-2025-3248 affects Langflow Langflow. Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.
How severe is CVE-2025-3248?
CVE-2025-3248 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 100%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 26 May 2025.
How should organisations respond to CVE-2025-3248?
Apply the vendor patch for Langflow Langflow as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.