CVE-2026-25889 File Browser has an Authentication Bypass in User Password Update
An attacker with a valid token can bypass password verification to change passwords, enabling account takeover in File Browser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-25889?
CVE-2026-25889 is a medium-severity authentication bypass vulnerability in filebrowser, published on 9 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, a case-sensitivity flaw in the password validation logic allows any authenticated user to change their password (or an admin to change any user's password) without providing the current password. By using Title Case field name "Password" instead of lowercase "password" in the API request, the current_password verification is completely bypassed. This enables account takeover if an attacker obtains a valid JWT token through XSS, session hijacking, or other means. This vulnerability is fixed in 2.57.1.
Weakness: CWE-178
Which versions are affected by CVE-2026-25889?
4 open source packages ship an affected version, including github.com/filebrowser/filebrowser/v2 and github.com/filebrowser/filebrowser. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.57.1 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.57.1 |
github.com/filebrowser/filebrowser/v2 Go | All versions | 2.57.1 |
github.com/filebrowser/filebrowser Go | All versions | None |
Products include Filebrowser Filebrowser.
How do I fix CVE-2026-25889?
Upgrade github.com/filebrowser/filebrowser/v2 to 2.57.1 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-25889 being exploited?
There is no known exploitation of CVE-2026-25889 in the wild and no public exploit code.
Other vulnerabilities in filebrowser
- CVE-2026-32760 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin
- CVE-2026-29188 File Browser: TUS Delete Endpoint Bypasses Delete Permission Check
- CVE-2023-39612 Cross-site scripting in n/a
- CVE-2026-30934 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
- CVE-2021-46398 Cross-Site Request Forgery in Filebrowser
Sources
Also known as GHSA-hxw8-4h9j-hq2r, GO-2026-4475.