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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.

PUBLISHED Reserved 2026-04-01 | Published 2026-04-02 | Updated 2026-04-02 | Assigner VulDB




MEDIUM: 5.3CVSS: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
MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
MEDIUM: 4.3CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
4.0AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Permissive Cross-domain Policy with Untrusted Domains

Origin Validation Error

Product status

2.0.0
affected

2.0.1
affected

2.0.2
affected

Timeline

2026-04-01:Advisory disclosed
2026-04-01:VulDB entry created
2026-04-01:VulDB entry last update

Credits

Yu_Bao (VulDB User) reporter

VulDB coordinator

References

vuldb.com/vuln/354653 (VDB-354653 | vanna-ai vanna FastAPI/Flask Server cross-domain policy) vdb-entry

vuldb.com/vuln/354653/cti (VDB-354653 | CTI Indicators (IOB, IOC)) signature permissions-required

vuldb.com/submit/780729 (Submit #780729 | vanna-ai vanna 2.0.2 CORS Origin Reflection with Credentials) third-party-advisory

github.com/August829/CVEP/issues/14 exploit issue-tracking

cve.org (CVE-2026-5321)

nvd.nist.gov (CVE-2026-5321)

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