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.

CVSS v4.0

2.1 LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v2.0

4.0 MEDIUMAV:N/AC:L/Au:S/C:N/I:P/A:N

EPSS

0.16% chance of exploitation in the next 30 days, 6th percentile

Published

2026-04-02

Proof-of-concept exploits (1)

• August829/CVEP/issues/14

References

• CVE Record
• NVD entry

Related

• CVE-2026-5320
• CVE-2026-5322
• CVE-2026-5319
• CVE-2026-5323
• CVE-2026-5318
• CVE-2026-5325