CVE-2026-5320
Published: 02 April 2026
Summary
CVE-2026-5320 is a high-severity Improper Authentication (CWE-287) vulnerability. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
This vulnerability is AI-related — categorised as Other AI Platforms.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SC-14 (Public Access Protections).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Enforces approved authorizations including authentication on the Chat API endpoint to prevent unauthorized remote manipulation.
Requires identification and authentication interfaces for public access protections on vulnerable web API endpoints like /api/vanna/v2/.
Monitors and controls communications at external boundaries to block unauthenticated access to the remote Chat API endpoint.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Missing authentication vulnerability in public-facing Chat API endpoint directly enables remote exploitation without credentials, mapping to T1190 for initial access to the application.
NVD Description
A vulnerability was detected in vanna-ai vanna up to 2.0.2. Affected by this vulnerability is an unknown functionality of the file /api/vanna/v2/ of the component Chat API Endpoint. Performing a manipulation results in missing authentication. The attack can be initiated…
more
remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Deeper analysisAI
CVE-2026-5320 is a missing authentication vulnerability affecting vanna-ai vanna versions up to 2.0.2. The issue resides in an unknown functionality within the /api/vanna/v2/ file of the Chat API Endpoint component. Manipulation of this endpoint bypasses required authentication checks, as classified under CWE-287 (Improper Authentication) and CWE-306 (Missing Authentication for Critical Function). The vulnerability carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) and was published on 2026-04-02.
Remote attackers require no privileges or user interaction to exploit this vulnerability over the network with low complexity. Successful exploitation grants limited impact on confidentiality, integrity, and availability, potentially allowing unauthorized access to chat API functions.
Advisories reference disclosure details but note that the vendor was contacted early without any response, and no patches or mitigations are mentioned. Relevant URLs include https://github.com/August829/CVEP/issues/13, https://vuldb.com/submit/780727, https://vuldb.com/vuln/354652, and https://vuldb.com/vuln/354652/cti.
The exploit is public and publicly available for use, with vanna-ai's AI-driven nature potentially exposing deployments in data querying or analytics environments to unauthorized API interactions.
Details
- CWE(s)
AI Security AnalysisAI
- AI Category
- Other AI Platforms
- Risk Domain
- N/A
- OWASP Top 10 for LLMs 2025
- None mapped
- Classification Reason
- Matched keywords: ai