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.
CVE-2026-54685
MEDIUMPre-NVD 5.35.3—Elevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EG Risk
- 55(Attend)EG Risk 55/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity53% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS
- 18.9%
- KEV
- Not listed
Published
March 24, 2026
Last Modified
July 22, 2026
Advisory Details (3)
Auto-updated Jul 22, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available
Username Enumeration via Authentication Timing Side-Channel · Advisory · gtsteffaniak/filebrowser · GitHub
https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-7789-65hx-f26wgithub_release Patch Available
v1.3.2-beta
Patch available: gtsteffaniak/filebrowser v1.3.2-beta
https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.2-betagithub_commit
commit af08800667b8 (gtsteffaniak/filebrowser)
Fix landed in gtsteffaniak/filebrowser commit af08800667b8 — awaiting tagged release
https://github.com/gtsteffaniak/filebrowser/commit/af08800667b874620edc6f44c3e2e64fec7abd85Vendor Advisories for CVE-2026-54685(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
Go(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| github.com/gtsteffaniak/filebrowser/backend | — | 0.0.0-20260317230626-af08800667b8 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 03:19 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-08 17:45 UTCEG score recompute
Frequently asked(5)
What is CVE-2026-54685?
CVE-2026-54685 is a medium vulnerability published on March 24, 2026. 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…
When was CVE-2026-54685 disclosed?
CVE-2026-54685 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54685 actively exploited?
CVE-2026-54685 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54685?
CVE-2026-54685 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-54685?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54685, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-54685
Is Your Infrastructure Affected by CVE-2026-54685?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.