vanna-ai vanna up to 2.0.2 FastAPI/Flask Server cross-domain policy

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.9$0-$5k1.27

Summaryinfo

A vulnerability was found in vanna-ai vanna up to 2.0.2. It has been classified as critical. This affects an unknown part of the component FastAPI/Flask Server. The manipulation leads to cross-domain policy. This vulnerability is listed as CVE-2026-5321. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in vanna-ai vanna up to 2.0.2. It has been rated as problematic. This issue affects an unknown code block of the component FastAPI/Flask Server. The manipulation with an unknown input leads to a cross-domain policy vulnerability. Using CWE to declare the problem leads to CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. Impacted is integrity.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-5321. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are unknown but a public exploit is available.

The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18122). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross-domain policy
CWE: CWE-942 / CWE-346 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/01/2026 Advisory disclosed
04/01/2026 +0 days VulDB entry created
04/02/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-5321 (🔒)
GCVE (CVE): GCVE-0-2026-5321
GCVE (VulDB): GCVE-100-354653
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/01/2026 15:05
Updated: 04/02/2026 09:42
Changes: 04/01/2026 15:05 (56), 04/02/2026 09:42 (1)
Complete: 🔍
Submitter: Yu_Bao
Cache ID: 216:818:103

Submitinfo

Accepted

  • Submit #780729: vanna-ai vanna 2.0.2 CORS Origin Reflection with Credentials (by Yu_Bao)

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