CVE-2026-27611 FileBrowser Quantum: Password Protection Not Enforced on Shared File Links
Attackers can bypass password protection on shared file links in FileBrowser Quantum to download files without authorization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-27611?
CVE-2026-27611 is a high-severity authentication bypass vulnerability in gtsteffaniak filebrowser, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to versions 1.1.3-stable and 1.2.6-beta, when users share password-protected files, the recipient can completely bypass the password and still download the file. This happens because the API returns a direct download link in the details of the share, which is accessible to anyone with JUST THE SHARE LINK, even without the password. Versions 1.1.3-stable and 1.2.6-beta fix the issue.
Which versions are affected by CVE-2026-27611?
3 open source packages ship an affected version, including github.com/gtsteffaniak/filebrowser/backend. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/gtsteffaniak/filebrowser/backend Go | All versions | 0.0.0-20260221163904-dbcfba993b85 |
github.com/gtsteffaniak/filebrowser/backend Go | All versions | 0.0.0-20260221163904-dbcfba993b85 |
github.com/gtsteffaniak/filebrowser/backend Go | All versions | 0.0.0-20260221163904-dbcfba993b85 |
Products include Gtsteffaniak Filebrowser Quantum.
How do I fix CVE-2026-27611?
Upgrade github.com/gtsteffaniak/filebrowser/backend to 0.0.0-20260221163904-dbcfba993b85 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-27611 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27611 exists.
Other vulnerabilities in gtsteffaniak filebrowser
Sources
Also known as GHSA-8vrh-3pm2-v4v6, GO-2026-4546.