CVE-2026-72836

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-14. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
52(Track*)
EG Risk 52/100SSVC: Track*

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 computed
Severity81% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

August 14, 2026

Last Modified

August 18, 2026

Advisory Details (3)

Auto-updated Aug 14, 2026
Patch available. Sources: github, github_commit.
generic

FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass
github_commit

commit fe7efb2e6afe (filebrowser/filebrowser)

Fix landed in filebrowser/filebrowser commit fe7efb2e6afe — awaiting tagged release

https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0
github Patch Available

Case-folded signup usernames share one home directory on case-insensitive filesystems · Advisory · filebrowser/filebrowser · GitHub

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84

Vendor Advisories for CVE-2026-72836(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 33× in last 7d / 33× 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.

  1. 2026-08-21 06:57 UTCEG score recompute
  2. 2026-08-21 06:57 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 18:12 UTCGHSA enrichment
  5. 2026-08-20 05:27 UTCEG score recompute
  6. 2026-08-20 05:27 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 16:42 UTCGHSA enrichment
  9. 2026-08-19 03:56 UTCGHSA enrichment
  10. 2026-08-18 15:11 UTCEG score recompute
  11. 2026-08-18 15:11 UTCGHSA enrichment
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 02:20 UTCEG score recompute
  15. 2026-08-18 02:20 UTCGHSA enrichment
  16. 2026-08-17 21:36 UTCEG score recompute
  17. 2026-08-17 21:36 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 08:50 UTCGHSA enrichment
  20. 2026-08-16 20:06 UTCEG score recompute
  21. 2026-08-16 20:06 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 07:21 UTCEG score recompute
  25. 2026-08-16 07:21 UTCGHSA enrichment
Show 8 more
  1. 2026-08-16 02:15 UTCEPSS rescore
  2. 2026-08-15 18:37 UTCGHSA enrichment
  3. 2026-08-15 05:52 UTCGHSA enrichment
  4. 2026-08-14 17:07 UTCEG score recompute
  5. 2026-08-14 17:06 UTCGHSA enrichment
  6. 2026-08-14 12:22 UTCEG score recompute
  7. 2026-08-14 11:49 UTCEG score recompute
  8. 2026-08-14 11:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-72836?
CVE-2026-72836 is a high vulnerability published on August 14, 2026. FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered…
When was CVE-2026-72836 disclosed?
CVE-2026-72836 was first published in the National Vulnerability Database on August 14, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-72836 actively exploited?
CVE-2026-72836 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.0% of all scored CVEs.
What is the CVSS score of CVE-2026-72836?
CVE-2026-72836 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-72836?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-72836, 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

Explore the affected products and dependency analysis for CVE-2026-72836

Explore →

Is Your Infrastructure Affected by CVE-2026-72836?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs