CVE-2026-90929

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. 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 week
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: None knownExposed: 0

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

File Browser versions >= 2.5.0 and <= 2.63.23 contain an incorrect authorization flaw in the direct-upload endpoint (resourcePostHandler in http/resource.go). Unlike the TUS upload handler, the direct-upload handler does not reject a target that is an existing directory; a POST with ?override=true aimed at a directory fails inside writeFile (a directory cannot be opened for writing) and the failure-cleanup path then calls Fs.RemoveAll on the request path, recursively deleting the entire tree. This cleanup is gated by neither the Perm.Delete permission nor the checkDescendants rule walk applied by the delete and patch handlers, so an authenticated non-administrator holding only the default Create and Modify permissions can delete directories they are not authorized to delete, including rule-denied files within them. Deletion remains confined to the user's scope because ScopedFs.RemoveAll still enforces the scope guard. The faulty cleanup was introduced in v2.5.0; no patched version is available.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

File Browser 2.5.0 Directory Deletion via Upload Failure Cleanup | Advisories | VulnCheck

https://www.vulncheck.com/advisories/file-browser-2.5.0-directory-deletion-via-upload-failure-cleanup
github Patch Available🟡 PoC Available

Upload failure-cleanup recursively deletes directories, bypassing Perm.Delete and deny rules · Advisory · filebrowser/filebrowser · GitHub

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-c4fr-5f24-4wrj

Vendor Advisories for CVE-2026-90929(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 27× in last 7d / 46× 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. 2026-09-25 10:06 UTCGHSA enrichment
  2. 2026-09-24 20:56 UTCGHSA enrichment
  3. 2026-09-24 16:22 UTCEG score recompute
  4. 2026-09-24 16:22 UTCGHSA enrichment
  5. 2026-09-24 14:04 UTCEPSS rescore
  6. 2026-09-24 03:12 UTCEG score recompute
  7. 2026-09-24 03:12 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 14:02 UTCGHSA enrichment
  10. 2026-09-23 00:52 UTCEG score recompute
  11. 2026-09-23 00:52 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 11:41 UTCGHSA enrichment
  14. 2026-09-21 22:31 UTCEG score recompute
  15. 2026-09-21 22:31 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 09:21 UTCEG score recompute
  18. 2026-09-21 09:21 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 20:11 UTCGHSA enrichment
  21. 2026-09-20 07:01 UTCGHSA enrichment
  22. 2026-09-19 17:51 UTCEG score recompute
  23. 2026-09-19 17:51 UTCGHSA enrichment
  24. 2026-09-19 04:40 UTCEG score recompute
  25. 2026-09-19 04:40 UTCGHSA enrichment
Show 21 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 15:30 UTCGHSA enrichment
  3. 2026-09-18 02:20 UTCEG score recompute
  4. 2026-09-18 02:20 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 13:10 UTCGHSA enrichment
  7. 2026-09-17 00:00 UTCEG score recompute
  8. 2026-09-17 00:00 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 10:50 UTCEG score recompute
  11. 2026-09-16 10:50 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 21:40 UTCGHSA enrichment
  14. 2026-09-15 08:30 UTCGHSA enrichment
  15. 2026-09-14 19:20 UTCEG score recompute
  16. 2026-09-14 19:20 UTCGHSA enrichment
  17. 2026-09-14 18:26 UTCEG score recompute
  18. 2026-09-14 18:26 UTCGHSA enrichment
  19. 2026-09-14 13:28 UTCEG score recompute
  20. 2026-09-14 13:00 UTCEG score recompute
  21. 2026-09-14 12:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90929?
CVE-2026-90929 is a high vulnerability published on September 14, 2026. File Browser versions >= 2.5.0 and <= 2.63.23 contain an incorrect authorization flaw in the direct-upload endpoint (resourcePostHandler in http/resource.go). Unlike the TUS upload handler, the direct-upload handler does not reject a target that is an existing directory; a POST with ?override=true…
When was CVE-2026-90929 disclosed?
CVE-2026-90929 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90929 actively exploited?
CVE-2026-90929 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-90929?
CVE-2026-90929 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-90929?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90929, 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-2026-90929

Explore →

Is Your Infrastructure Affected by CVE-2026-90929?

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

Book a Demo →Browse All CVEs