# CVE-2026-108725: Cheshire Cat AI core through 2.0.23 Stored XSS via uploads plugin

> Authenticated users can upload malicious HTML files to execute scripts in the application origin, potentially stealing administrator access tokens.

- **Severity:** Medium 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Oct 2026
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-37wv-8fg5-p97x

## What is CVE-2026-108725?

CVE-2026-108725 is a medium-severity cross-site scripting vulnerability in cheshire-cat-ai core, published on 11 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-108725?


## How do I fix CVE-2026-108725?

No fix has been published for CVE-2026-108725 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-108725 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108725 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-108725 and fix it if it is affected.

What it is: CVE-2026-108725 is a medium-severity cross-site scripting vulnerability in cheshire-cat-ai core, published on 11 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-108725 exists.

Affected product: cheshire-cat-ai core. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-108725/ (Markdown: https://insights.sbomify.com/CVE-2026-108725/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-108725
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108725
- OSV: https://osv.dev/vulnerability/CVE-2026-108725

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-108725/
Summaries are generated and may contain mistakes; the official description above is the record.