CVE-2026-72836

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM 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 — 3 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: 0.5%CVSS: 8.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
8.1HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA SSVC

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%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 14, 2026

Last Modified

September 8, 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 16× in last 7d / 90× 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.

Showing the most recent 100 of 175 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 22:13 UTCGHSA enrichment
  3. 2026-10-04 08:27 UTCGHSA enrichment
  4. 2026-10-03 19:42 UTCEG score recompute
  5. 2026-10-03 19:42 UTCGHSA enrichment
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-02 21:50 UTCEG score recompute
  8. 2026-10-02 21:50 UTCGHSA enrichment
  9. 2026-10-02 07:21 UTCEG score recompute
  10. 2026-10-02 07:21 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 10:26 UTCGHSA enrichment
  13. 2026-09-30 21:41 UTCEG score recompute
  14. 2026-09-30 21:41 UTCGHSA enrichment
  15. 2026-09-29 02:59 UTCEG score recompute
  16. 2026-09-29 02:59 UTCGHSA enrichment
  17. 2026-09-28 13:52 UTCEPSS rescore
  18. 2026-09-28 13:12 UTCGHSA enrichment
  19. 2026-09-28 00:27 UTCEG score recompute
  20. 2026-09-28 00:27 UTCGHSA enrichment
  21. 2026-09-27 13:48 UTCEPSS rescore
  22. 2026-09-27 09:39 UTCEG score recompute
  23. 2026-09-27 09:39 UTCGHSA enrichment
  24. 2026-09-26 15:59 UTCEPSS rescore
  25. 2026-09-25 03:23 UTCEG score recompute
Show 75 more
  1. 2026-09-25 03:23 UTCGHSA enrichment
  2. 2026-09-24 01:22 UTCEG score recompute
  3. 2026-09-24 01:22 UTCGHSA enrichment
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 12:37 UTCGHSA enrichment
  6. 2026-09-22 23:49 UTCEG score recompute
  7. 2026-09-22 23:49 UTCGHSA enrichment
  8. 2026-09-22 10:52 UTCGHSA enrichment
  9. 2026-09-21 22:08 UTCEG score recompute
  10. 2026-09-21 22:08 UTCGHSA enrichment
  11. 2026-09-21 21:09 UTCEPSS rescore
  12. 2026-09-21 09:22 UTCEG score recompute
  13. 2026-09-21 09:22 UTCGHSA enrichment
  14. 2026-09-20 20:16 UTCEPSS rescore
  15. 2026-09-20 18:47 UTCGHSA enrichment
  16. 2026-09-20 05:03 UTCGHSA enrichment
  17. 2026-09-19 16:18 UTCEG score recompute
  18. 2026-09-19 16:18 UTCGHSA enrichment
  19. 2026-09-19 03:33 UTCEG score recompute
  20. 2026-09-19 03:33 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 14:47 UTCGHSA enrichment
  23. 2026-09-18 02:02 UTCEG score recompute
  24. 2026-09-18 02:02 UTCGHSA enrichment
  25. 2026-09-17 13:17 UTCGHSA enrichment
  26. 2026-09-16 23:49 UTCEG score recompute
  27. 2026-09-16 23:49 UTCGHSA enrichment
  28. 2026-09-16 14:08 UTCEPSS rescore
  29. 2026-09-16 11:02 UTCEG score recompute
  30. 2026-09-16 11:02 UTCGHSA enrichment
  31. 2026-09-16 05:15 UTCEPSS rescore
  32. 2026-09-15 22:17 UTCGHSA enrichment
  33. 2026-09-15 09:29 UTCEG score recompute
  34. 2026-09-15 09:29 UTCGHSA enrichment
  35. 2026-09-15 03:12 UTCEPSS rescore
  36. 2026-09-14 20:43 UTCGHSA enrichment
  37. 2026-09-14 07:46 UTCGHSA enrichment
  38. 2026-09-13 19:01 UTCEG score recompute
  39. 2026-09-13 19:01 UTCGHSA enrichment
  40. 2026-09-13 06:06 UTCGHSA enrichment
  41. 2026-09-12 17:21 UTCEG score recompute
  42. 2026-09-12 17:21 UTCGHSA enrichment
  43. 2026-09-12 15:02 UTCEPSS rescore
  44. 2026-09-12 04:35 UTCGHSA enrichment
  45. 2026-09-11 15:49 UTCEG score recompute
  46. 2026-09-11 15:49 UTCGHSA enrichment
  47. 2026-09-11 14:53 UTCEPSS rescore
  48. 2026-09-11 03:03 UTCGHSA enrichment
  49. 2026-09-10 14:18 UTCEG score recompute
  50. 2026-09-10 14:18 UTCGHSA enrichment
  51. 2026-09-10 09:35 UTCEPSS rescore
  52. 2026-09-10 01:33 UTCGHSA enrichment
  53. 2026-09-09 09:39 UTCEG score recompute
  54. 2026-09-09 09:39 UTCGHSA enrichment
  55. 2026-09-08 22:01 UTCEPSS rescore
  56. 2026-09-08 20:54 UTCGHSA enrichment
  57. 2026-09-08 07:40 UTCGHSA enrichment
  58. 2026-09-07 18:51 UTCGHSA enrichment
  59. 2026-09-07 06:05 UTCGHSA enrichment
  60. 2026-09-06 17:20 UTCEG score recompute
  61. 2026-09-06 17:20 UTCGHSA enrichment
  62. 2026-09-06 13:48 UTCEPSS rescore
  63. 2026-09-06 04:34 UTCGHSA enrichment
  64. 2026-09-05 15:49 UTCEG score recompute
  65. 2026-09-05 15:48 UTCGHSA enrichment
  66. 2026-09-05 03:01 UTCGHSA enrichment
  67. 2026-09-04 14:08 UTCEG score recompute
  68. 2026-09-04 14:08 UTCGHSA enrichment
  69. 2026-09-04 05:07 UTCEPSS rescore
  70. 2026-09-04 01:20 UTCGHSA enrichment
  71. 2026-09-03 12:33 UTCGHSA enrichment
  72. 2026-09-02 22:58 UTCEG score recompute
  73. 2026-09-02 22:58 UTCGHSA enrichment
  74. 2026-09-02 14:12 UTCEPSS rescore
  75. 2026-09-02 01:57 UTCEG score recompute

Related CVEs(same CWE)

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 on August 14, 2026, with the most recent update on September 8, 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 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-72836?
CVE-2026-72836 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-72836?
A fix for CVE-2026-72836 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-72836 are linked in the Vendor Advisories panel on this page.

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