CVE-2026-54054 Transmute has full-read SSRF in URL file import (POST /api/files/url) — no host/IP validation, follows redirects
An authenticated user can exploit a Server-Side Request Forgery vulnerability in the URL import endpoint to read internal or cloud-local resources via the server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54054?
CVE-2026-54054 is a medium-severity server-side request forgery vulnerability in transmute-app transmute, published on 10 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Transmute is a free, open-source, self-hosted file conversion and compression tool. Prior to version 1.3.0, Transmute's URL import endpoint, `POST /api/files/url`, is vulnerable to Server-Side Request Forgery (SSRF). The HTTP downloader used by this endpoint fetches user-supplied URLs with redirects enabled and does not validate whether the target resolves to a public, external address. As a result, an authenticated user (or guest user if they are enabled) may be able to cause the Transmute server to make HTTP requests to internal or cloud-local resources from the server's network position. Because downloaded content is stored and can later be retrieved through `GET /api/files/{id}`, this issue can result in full-read SSRF rather than blind SSRF. This is fixed in version 1.3.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-54054?
How do I fix CVE-2026-54054?
No fix has been published for CVE-2026-54054 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-54054 being exploited?
There is no known exploitation of CVE-2026-54054 in the wild and no public exploit code.
Sources
Also known as GHSA-89m5-mvmx-7xrf.