Vulnerability in Vanna-Ai Vanna
CVE-2026-5321
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Vanna-Ai Vanna — versions 2.0.0, 2.0.1, 2.0.2
Weakness classification (CWE)
References
- vuldb.com/vuln/354653 (vdb-entry)
- vuldb.com/vuln/354653/cti (signature, permissions-required)
- vuldb.com/submit/780729 (third-party-advisory)
- github.com/August829/CVEP/issues/14 (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-5321?
- CVE-2026-5321 is a medium-severity vulnerability in Vanna-Ai Vanna, classified under Origin Validation Error. CVSS score: 4.3/10. Published 2026-04-02.
- How severe is CVE-2026-5321?
- Medium severity. CVSS v3 base score is 4.3 out of 10.