Is CVE-2026-5321 actively exploited?

No active exploitation of CVE-2026-5321 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5321 be exploited remotely?

Yes. CVE-2026-5321 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5321?

CVE-2026-5321 has a CVSS score of 4.3 (MEDIUM).

HOME VULNERABILITIESCVE-2026-5321

MEDIUM

CVE-2026-5321

CWE-346Published: April 2, 2026· Updated: Apr 3, 2026

4.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.2th

Official Description

A flaw has been found in vanna-ai vanna up to 2.0.2. Affected by this issue is some unknown functionality of the component FastAPI/Flask Server. Executing a manipulation can lead to permissive cross-domain policy with untrusted domains. The attack can be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

NVD Source

Technical Analysis

CVE-2026-5321 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.