CVE-2025-3248 — Langflow Missing Authentication Vulnerability

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
langflow-ai	langflow	0

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2025-05-05. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-04-07T14:22:38.980Z
• Last modified: 2025-11-29T02:05:33.261Z
• Added to CISA KEV: 2025-05-05
• BOD 22-01 due: 2025-05-26

09References

• github.com — https://github.com/langflow-ai/langflow/pull/6911
• github.com — https://github.com/langflow-ai/langflow/releases/tag/1.3.0
• www.horizon3.ai — https://www.horizon3.ai/attack-research/disclosures/unsafe-at-any-speed-abusing-…
• www.vulncheck.com — https://www.vulncheck.com/advisories/langflow-unauthenticated-rce