Vulnerability · Published Apr 2, 2026 · Assigned by VulDB

CVE-2026-5321vanna-ai vanna FastAPI/Flask Server cross-domain policy

Medium 4.3

In plain English

A medium-severity security flaw in vanna from vanna-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 94.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
vanna-ai	vanna	2.0.02.0.12.0.2

Weakness: CWE-942, CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References

VDB-354653 | vanna-ai vanna FastAPI/Flask Server cross-domain policy vdb-entry
VDB-354653 | CTI Indicators (IOB, IOC) signature, permissions-required
Submit #780729 | vanna-ai vanna 2.0.2 CORS Origin Reflection with Credentials third-party-advisory
https://github.com/August829/CVEP/issues/14 exploit, issue-tracking