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CVE-2025-3248

Langflow Missing Authentication

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 100.0%
  1. Published7 Apr 2025
  2. Added to CISA KEV5 May 2025
  3. Remediation due26 May 2025
Actively exploited (CISA KEV)

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.

Added to KEV: 5 May 2025Federal remediation due: 26 May 2025Used in ransomware

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Langflow< 1.3.0

Remediation

Fixed in
Langflow≥ 1.3.0

References

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Frequently asked

Is CVE-2025-3248 being actively exploited?

Yes. CVE-2025-3248 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 5 May 2025. It has been used in ransomware campaigns.

How severe is CVE-2025-3248?

CVE-2025-3248 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 100.0% probability of exploitation.

Which products are affected by CVE-2025-3248?

Affected products include Langflow.

How do I fix CVE-2025-3248?

Upgrade affected software to a fixed version, for example Langflow 1.3.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-3248 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.