---
id: CVE-2026-108725
title: >-
  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
summary: >-
  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
  publi…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: cheshire-cat-ai
product: core
affected:
  - core <= 2.0.23
published: '2026-10-11'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:18:44.867'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108725'
references:
  - url: 'https://github.com/cheshire-cat-ai/core'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/cheshire-cat-ai/core/blob/c22731e7009ac89835b1d7b1cabc5989d998ec3e/src/cat/scaffold/plugins/uploads/endpoints.py#L28-L96
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@haind03/cheshire-cat-uploads-stored-html-same-origin-xss
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cheshire-cat-ai-core-through-2.0.23-stored-xss-via-uploads-plugin
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@haind03/cheshire-cat-uploads-stored-html-same-origin-xss
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00264
epssPercentile: 0.1819
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T13:18:05.919586Z'
ingestedAt: '2026-10-11T13:51:17.029Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.