XSS in Cheshire-Cat-Ai Core
CVE-2026-108725
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind03/cheshire-cat-uploads-stored-html-same-origin-xss (third-party-advisory)
- github.com/cheshire-cat-ai/core/blob/c22731e7009ac89835b1d7b1cabc5989d998ec3e/s… (technical-description)
- github.com/cheshire-cat-ai/core (product)
- www.vulncheck.com/advisories/cheshire-cat-ai-core-through-2.0.23-stored-xss-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108725?
- CVE-2026-108725 is a medium-severity vulnerability in Cheshire-Cat-Ai Core, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-11.
- How severe is CVE-2026-108725?
- Medium severity. CVSS v3 base score is 5.4 out of 10.