CVE-2025-3248
Published: May 5, 2025
Official Description
Langflow contains a missing authentication vulnerability in the /api/v1/validate/code endpoint that allows a remote, unauthenticated attacker to execute arbitrary code via crafted HTTP requests.
CISA KEV Advisory
Langflow Missing Authentication Vulnerability
Langflow contains a missing authentication vulnerability in the /api/v1/validate/code endpoint that allows a remote, unauthenticated attacker to execute arbitrary code via crafted HTTP requests.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Risk Analysis
This vulnerability in Langflow's /api/v1/validate/code endpoint allows a remote, unauthenticated attacker to execute arbitrary code. The high EPSS score of 0.91966 indicates a very high likelihood of exploitation, making this a critical concern. It is confirmed as exploited by CISA.
Active exploitation of this vulnerability has been observed in the wild. The flaw is remotely exploitable without authentication.
Organizations should apply available patches or upgrades for Langflow immediately. Implement strong network segmentation and access controls to limit exposure of critical systems.
Technical Analysis
CVE-2025-3248 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2025-3248 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-3248 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1