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

Quick assessment

Affected
gtsteffaniak filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gtsteffaniak filebrowser是gtsteffaniak的文件管理服务器。 gtsteffaniak filebrowser 1.3.2-beta之前版本存在侧信道信息泄露漏洞，该漏洞源于 认证端点未在恒定时间内执行，可能导致时间延迟差异，从而泄露用户信息。

CVSS 5.3 · Medium EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing

Affected Version Matrix 1

VendorProduct Version RangeStatus
gtsteffaniak filebrowser < 1.3.2-beta affected
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I. Basic Information for CVE-2026-54685

Vulnerability Information
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Vulnerability Title
FileBrowser Quantum has Username Enumeration via Authentication Timing Side-Channel
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
gtsteffaniak filebrowser 侧信道信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gtsteffaniak filebrowser是gtsteffaniak的文件管理服务器。 gtsteffaniak filebrowser 1.3.2-beta之前版本存在侧信道信息泄露漏洞，该漏洞源于`/api/auth/login`认证端点未在恒定时间内执行，可能导致时间延迟差异，从而泄露用户信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gtsteffaniak filebrowser < 1.3.2-beta -

II. Public POCs for CVE-2026-54685

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III. Intelligence Information for CVE-2026-54685

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Patches & Fixes for CVE-2026-54685 (1)

Vendor Advisories for CVE-2026-54685 (1)

Vendor Pages for CVE-2026-54685 (1)

Same Patch Batch · gtsteffaniak · 2026-07-20 · 3 CVEs total

CVE-2026-54910 7.7 HIGH FileBrowser Quantum's path traversal issue in subtitle handler allows any authenticated us
CVE-2026-46410 FileBrowser Quantum: unauthenticated user share share info

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: gtsteffaniak
Same weakness: CWE-208

V. Comments for CVE-2026-54685

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