What’s Vulnerable › Vulnerabilities

CVE-2026-54685: FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-20 · updated 2026-10-24
• Weakness: CWE-208

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.

Affected products

• gtsteffaniak filebrowser: before 1.3.2-beta

References

• https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85
• https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-beta
• https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w
• https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26w

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