CVE-2026-108725CWE-79cross-site-scripting

CVE-2026-108725

Medium · published October 11, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
11.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00215 · 11.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-11T17:17Z
References (5)
https://github.com/cheshire-cat-ai/core · [email protected]https://github.com/cheshire-cat-ai/core/blob/c22731e7009ac89835b1d7b1cabc5989d998ec3e/src/cat/scaffold/plugins/uploads/endpoints.py#L28-L96 · [email protected]https://hackmd.io/@haind03/cheshire-cat-uploads-stored-html-same-origin-xss · [email protected]https://www.vulncheck.com/advisories/cheshire-cat-ai-core-through-2.0.23-stored-xss-via-uploads-plugin · [email protected]https://hackmd.io/@haind03/cheshire-cat-uploads-stored-html-same-origin-xss · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 13 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 11 OCT 12:19Z
    Cheshire Cat AI core through 2.0.23 Stored XSS via uploads plugin
    cvelistv5
  • 11 OCT 12:19Z
    Cheshire Cat AI core through 2.0.23 Stored XSS via uploads plugin
    cvelistv5