Threats / Langflow / CVE-2025-3248
CVE-2025-3248
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Langflow vulnerability
Langflow contains a missing authentication vulnerability in the /api/v1/validate/code endpoint that allows unauthenticated remote code execution via crafted HTTP requests.
Verdict
Today item — known-exploited.
An unauthenticated attacker can exploit missing authentication controls on a code validation endpoint to execute arbitrary code on affected Langflow instances. The vulnerability is actively exploited in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
346 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-05-05).
Probability (EPSS)
EPSS 0.99959 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Langflow, Langflow. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-306 Missing Authentication — weakness family: Authentication.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify the unauthenticated /api/v1/validate/code endpoint as lacking access controls.
Business
The organization's Langflow deployment is exposed to direct remote code execution without requiring valid credentials.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft malicious HTTP requests containing arbitrary code payloads to the unprotected endpoint.
Business
Attackers achieve code execution within the application runtime environment with no authentication barrier.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute commands with the privileges of the Langflow process to establish persistence or lateral movement.
Business
The compromise escalates from application-level access to potential infrastructure-wide impact depending on process privileges and network segmentation.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by VulnCheckCNA
Credited with finding itNaveen Sunkavally of Horizon3.aifinder