CVE-2026-54089

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM 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
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 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(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Aug 30, 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.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/filebrowser/filebrowser———
github.com/filebrowser/filebrowser/v2———

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 193× 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 317 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 1% probability of exploitation in the next 30 days, which ranks it in the top 53.4% of all scored CVEs.
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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