CVE-2026-55667

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 72% 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
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

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

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.16, a scoped, non-admin File Browser user holding only the Create permission can delete arbitrary files outside their scope (other tenants' data, and the application's own database) via the upload failure-cleanup path. ScopedFs.RemoveAll is the one dereferencing operation that skips the symlink guard every other method enforces. The direct-upload handler runs RemoveAll on the user-controlled path during failed-upload cleanup, gated only by Perm.Create. If an escaping directory symlink already exists inside the user's scope, an authenticated create-only user can delete an out-of-scope target, bypassing both the ScopedFs boundary and the Perm.Delete gate. This vulnerability is fixed in 2.63.16.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
28.0%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Out-of-scope file deletion by a Create-only scoped user via symlink-following RemoveAll in upload failure-cleanup · Advisory · filebrowser/filebrowser · GitHub

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-fmm7-x4gx-8jhr

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 55× 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. 2026-07-12 20:11 UTCEG score recompute
  2. 2026-07-12 07:31 UTCEG score recompute
  3. 2026-07-12 05:46 UTCEPSS rescore
  4. 2026-07-11 18:50 UTCEG score recompute
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-11 08:27 UTCEPSS rescore
  7. 2026-07-11 06:09 UTCEG score recompute
  8. 2026-07-10 17:23 UTCEG score recompute
  9. 2026-07-10 04:43 UTCEG score recompute
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-09 16:03 UTCEG score recompute
  13. 2026-07-09 03:19 UTCEG score recompute
  14. 2026-07-08 15:16 UTCEPSS rescore
  15. 2026-07-08 15:16 UTCEPSS rescore
  16. 2026-07-08 14:33 UTCEG score recompute
  17. 2026-07-08 01:52 UTCEG score recompute
  18. 2026-07-07 13:46 UTCEPSS rescore
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-07 13:12 UTCEG score recompute
  21. 2026-07-07 00:32 UTCEG score recompute
  22. 2026-07-06 11:52 UTCEG score recompute
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-06 02:23 UTCEPSS rescore
  25. 2026-07-05 23:10 UTCEG score recompute
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  1. 2026-07-05 10:26 UTCEG score recompute
  2. 2026-07-05 02:31 UTCEPSS rescore
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-04 21:45 UTCEG score recompute
  5. 2026-07-04 09:05 UTCEG score recompute
  6. 2026-07-04 06:31 UTCEPSS rescore
  7. 2026-07-04 06:31 UTCEPSS rescore
  8. 2026-07-03 20:24 UTCEG score recompute
  9. 2026-07-03 07:44 UTCEG score recompute
  10. 2026-07-02 19:04 UTCEG score recompute
  11. 2026-07-02 06:22 UTCEG score recompute
  12. 2026-07-01 17:42 UTCEG score recompute
  13. 2026-07-01 15:07 UTCEPSS rescore
  14. 2026-07-01 05:02 UTCEG score recompute
  15. 2026-06-30 23:22 UTCEPSS rescore
  16. 2026-06-30 16:21 UTCEG score recompute
  17. 2026-06-30 03:41 UTCEG score recompute
  18. 2026-06-29 14:59 UTCEG score recompute
  19. 2026-06-29 02:19 UTCEG score recompute
  20. 2026-06-28 14:07 UTCEPSS rescore
  21. 2026-06-28 13:39 UTCEG score recompute
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-28 00:58 UTCEG score recompute
  25. 2026-06-27 12:18 UTCEG score recompute
  26. 2026-06-27 03:08 UTCEPSS rescore
  27. 2026-06-26 23:38 UTCEG score recompute
  28. 2026-06-26 10:57 UTCEG score recompute
  29. 2026-06-25 19:50 UTCEG score recompute
  30. 2026-06-25 19:49 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-55667?
CVE-2026-55667 is a high vulnerability published on June 25, 2026. File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.16, a scoped, non-admin File Browser user holding only the Create permission can delete arbitrary files outside their scope (other tenants' data,…
When was CVE-2026-55667 disclosed?
CVE-2026-55667 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55667 actively exploited?
CVE-2026-55667 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55667?
CVE-2026-55667 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-55667?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55667, 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.

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