Login Request a demo
Medium severity · published Jul 20, 2026
CVE-2026-54685
FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to version 1.3.2-beta, the `/api/auth/login` authentication endpoint does not execute in constant time. When a non-existent username is supplied, the server returns a `401`/`403` response almost immediately. When a valid username is provided, the server performs a bcrypt password comparison, causing a measurable delay in the response time. Version 1.3.2-beta patches the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
filebrowser · gtsteffaniak
< 1.3.2-beta · source: vendor
Affected product
FI
filebrowser
gtsteffaniak
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54685
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54685
github.com
https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85
github.com
https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta
github.com
https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w
More from filebrowser
9.3
CVE-2026-48777
FileBrowser Quantum: Path Traversal in public share PATCH allows file ops outside shared directory
9.1
CVE-2026-44542
FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion
8.7
CVE-2026-46410
FileBrowser Quantum: unauthenticated user share share info
8.6
CVE-2026-116682
FileBrowser Quantum: Symlink following escapes user scope allowing arbitrary file read outside the served directory
7.7
CVE-2026-54910
FileBrowser Quantum's path traversal issue in subtitle handler allows any authenticated user to read arbitrary files