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Varaxon Technologies

Known exploited vulnerability · CISA KEV

CVE-2025-3248: 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.

CVE-2025-3248

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2025-05-05: attackers are using it right now. It is known to be used in ransomware campaigns.

CISA KEV
Listed
Added 2025-05-05 · federal fix-by 2025-05-26
EPSS (30 days)
over 99.9%
Higher than 99.9% of CVEs · 2026-11-01
CVSS v3.1
9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

Langflow Missing Authentication Vulnerability

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

NVD description · published 2025-04-07

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.

Full record on NVD

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How to check if you are exposed to CVE-2025-3248

  1. Find every Langflow system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2025-3248.

US federal agencies had to fix this by 2025-05-26. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2025-3248. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Langflowbefore 1.3.0

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 28 days after it was published
  3. · Fix-by date for US federal agencies, passed 524 days ago

Vendor advisories and fixes

Weakness type

More exploited Langflow vulnerabilities

CISA lists 5 exploited Langflow vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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