CVE-2026-108725
Received Received - Intake

Stored XSS in Cheshire Cat AI Core via Unrestricted File Upload

Publication date: 2026-10-11

Last updated on: 2026-10-11

Assigner: VulnCheck

Description
Cheshire Cat AI core through 2.0.23 contains a stored cross-site scripting vulnerability in the uploads plugin that allows authenticated users to upload HTML files via POST /uploads without type restrictions. Attackers can send the public GET /uploads/{path} URL to a signed-in victim, executing script in the application origin with the victim's access_token cookie, including administrators.

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Meta Information

Published
2026-10-11
Last Modified
2026-10-11
Generated
2026-10-11
AI Q&A
2026-10-11
EPSS Evaluated
N/A
NVD
CVE-2026-108725
EUVD
EUVD-2026-96891

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
cheshire-cat-ai core 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in Cheshire Cat AI core versions up to 2.0.23. It allows authenticated users to upload HTML files without type restrictions via POST /uploads. Attackers can then send a crafted GET /uploads/{path} URL to a logged-in victim, executing malicious scripts in the application's origin using the victim's access_token cookie, including administrators.

Detection Guidance

Check for uploaded HTML files in the /uploads directory via GET /uploads/{path}. Look for unexpected files or scripts in user-specific directories. Monitor network traffic for POST requests to /uploads without proper file type restrictions.

Impact Analysis

An attacker could execute scripts in your browser session, allowing them to perform actions on your behalf such as reading or modifying chats. This could lead to unauthorized data access, session hijacking, or further compromise of your account, especially if you have administrative privileges.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. It may result in data breaches, unauthorized disclosures, and non-compliance with privacy regulations, potentially leading to legal and financial penalties.

Mitigation Strategies

Upgrade Cheshire Cat AI core to a version beyond 2.0.23. Restrict file uploads to non-HTML types. Implement authentication for GET /uploads/{path}. Add Content-Security-Policy headers to prevent inline script execution.

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