CVE-2026-54089

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-10. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: 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. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated attacker who can reach the server directly can impersonate any user - including admin - by sending a single forged HTTP header. No credentials are required. Additionally, specifying a non-existent username causes the server to automatically create a new user account, providing an account creation primitive with no authorization. This is an already known issue that has been documented in the documentation for several years, but has not been documented as a vulnerability before.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
—
EPSS
26.2%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 25, 2026

Advisory Details (1)

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

Authentication Bypass via Proxy Auth Header Forgery · Advisory · filebrowser/filebrowser · GitHub

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-xqp3-jq6g-x3qm

Vendor Advisories for CVE-2026-54089(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/filebrowser/filebrowser/v2—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 82× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 04:33 UTCGHSA enrichment
  9. 2026-07-17 00:56 UTCGHSA enrichment
  10. 2026-07-16 21:18 UTCGHSA enrichment
  11. 2026-07-16 17:37 UTCGHSA enrichment
  12. 2026-07-16 17:03 UTCEPSS rescore
  13. 2026-07-16 13:30 UTCGHSA enrichment
  14. 2026-07-16 09:46 UTCGHSA enrichment
  15. 2026-07-16 06:08 UTCGHSA enrichment
  16. 2026-07-16 02:28 UTCGHSA enrichment
  17. 2026-07-15 22:50 UTCGHSA enrichment
  18. 2026-07-15 19:12 UTCGHSA enrichment
  19. 2026-07-15 16:57 UTCEPSS rescore
  20. 2026-07-15 16:57 UTCEPSS rescore
  21. 2026-07-15 15:32 UTCGHSA enrichment
  22. 2026-07-15 11:53 UTCGHSA enrichment
  23. 2026-07-15 06:58 UTCGHSA enrichment
  24. 2026-07-15 03:19 UTCGHSA enrichment
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 57 more
  1. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-14 23:39 UTCGHSA enrichment
  3. 2026-07-14 19:39 UTCGHSA enrichment
  4. 2026-07-14 16:00 UTCGHSA enrichment
  5. 2026-07-14 12:23 UTCGHSA enrichment
  6. 2026-07-14 08:44 UTCGHSA enrichment
  7. 2026-07-14 05:05 UTCGHSA enrichment
  8. 2026-07-14 01:25 UTCGHSA enrichment
  9. 2026-07-13 22:31 UTCEPSS rescore
  10. 2026-07-13 21:48 UTCGHSA enrichment
  11. 2026-07-13 18:11 UTCGHSA enrichment
  12. 2026-07-13 14:31 UTCGHSA enrichment
  13. 2026-07-13 10:53 UTCGHSA enrichment
  14. 2026-07-13 07:15 UTCGHSA enrichment
  15. 2026-07-13 06:13 UTCEPSS rescore
  16. 2026-07-13 06:13 UTCEPSS rescore
  17. 2026-07-13 03:38 UTCGHSA enrichment
  18. 2026-07-13 00:00 UTCGHSA enrichment
  19. 2026-07-12 20:21 UTCGHSA enrichment
  20. 2026-07-12 16:43 UTCGHSA enrichment
  21. 2026-07-12 13:06 UTCGHSA enrichment
  22. 2026-07-12 09:28 UTCGHSA enrichment
  23. 2026-07-12 05:50 UTCGHSA enrichment
  24. 2026-07-12 05:46 UTCEPSS rescore
  25. 2026-07-12 02:12 UTCGHSA enrichment
  26. 2026-07-11 22:33 UTCGHSA enrichment
  27. 2026-07-11 18:56 UTCGHSA enrichment
  28. 2026-07-11 15:19 UTCGHSA enrichment
  29. 2026-07-11 11:41 UTCGHSA enrichment
  30. 2026-07-11 08:27 UTCEPSS rescore
  31. 2026-07-11 08:27 UTCEPSS rescore
  32. 2026-07-11 08:04 UTCGHSA enrichment
  33. 2026-07-11 04:25 UTCGHSA enrichment
  34. 2026-07-11 00:48 UTCGHSA enrichment
  35. 2026-07-10 21:11 UTCGHSA enrichment
  36. 2026-07-09 19:10 UTCEPSS rescore
  37. 2026-07-09 19:10 UTCEPSS rescore
  38. 2026-07-08 15:16 UTCEPSS rescore
  39. 2026-07-08 15:16 UTCEPSS rescore
  40. 2026-07-07 13:46 UTCEPSS rescore
  41. 2026-07-07 13:46 UTCEPSS rescore
  42. 2026-07-06 16:27 UTCEPSS rescore
  43. 2026-07-06 16:27 UTCEPSS rescore
  44. 2026-07-06 02:23 UTCEPSS rescore
  45. 2026-07-06 02:23 UTCEPSS rescore
  46. 2026-07-05 02:31 UTCEPSS rescore
  47. 2026-07-05 02:30 UTCEPSS rescore
  48. 2026-07-04 06:31 UTCEPSS rescore
  49. 2026-07-04 06:31 UTCEPSS rescore
  50. 2026-07-01 15:07 UTCEPSS rescore
  51. 2026-06-30 23:22 UTCEPSS rescore
  52. 2026-06-28 14:07 UTCEPSS rescore
  53. 2026-06-28 04:56 UTCEPSS rescore
  54. 2026-06-28 04:56 UTCEPSS rescore
  55. 2026-06-27 03:08 UTCEPSS rescore
  56. 2026-06-25 19:50 UTCEG score recompute
  57. 2026-06-25 19:49 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-54089?
CVE-2026-54089 is a critical 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. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated attacker who can reach the server…
When was CVE-2026-54089 disclosed?
CVE-2026-54089 was first published in the National Vulnerability Database on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54089 actively exploited?
CVE-2026-54089 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 26.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54089?
CVE-2026-54089 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-54089?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54089, 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

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