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
Trending — 3 sources updated this week
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)
EPSS
25.8%
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 70× in last 7d / 144× 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 144 total refreshes for this CVE.

  1. 2026-07-12 09:28 UTCEG score recompute
  2. 2026-07-12 09:28 UTCGHSA enrichment
  3. 2026-07-12 05:50 UTCEG score recompute
  4. 2026-07-12 05:50 UTCGHSA enrichment
  5. 2026-07-12 05:46 UTCEPSS rescore
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  7. 2026-07-12 02:12 UTCGHSA enrichment
  8. 2026-07-11 22:33 UTCEG score recompute
  9. 2026-07-11 22:33 UTCGHSA enrichment
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  11. 2026-07-11 18:56 UTCGHSA enrichment
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  13. 2026-07-11 15:19 UTCGHSA enrichment
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  15. 2026-07-11 11:41 UTCGHSA enrichment
  16. 2026-07-11 08:27 UTCEPSS rescore
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  18. 2026-07-11 08:04 UTCEG score recompute
  19. 2026-07-11 08:04 UTCGHSA enrichment
  20. 2026-07-11 04:25 UTCEG score recompute
  21. 2026-07-11 04:25 UTCGHSA enrichment
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  23. 2026-07-11 00:48 UTCGHSA enrichment
  24. 2026-07-10 21:11 UTCEG score recompute
  25. 2026-07-10 21:11 UTCGHSA enrichment
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  1. 2026-07-10 17:32 UTCEG score recompute
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  8. 2026-07-09 19:10 UTCEPSS rescore
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  26. 2026-07-07 13:46 UTCEPSS rescore
  27. 2026-07-07 13:46 UTCEPSS rescore
  28. 2026-07-07 12:49 UTCEG score recompute
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  34. 2026-07-06 16:27 UTCEPSS rescore
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  40. 2026-07-06 02:23 UTCEPSS rescore
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  46. 2026-07-05 09:29 UTCEG score recompute
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  48. 2026-07-05 02:31 UTCEPSS rescore
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  50. 2026-07-05 02:13 UTCEG score recompute
  51. 2026-07-04 22:35 UTCEG score recompute
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  73. 2026-07-01 21:45 UTCEG score recompute
  74. 2026-07-01 18:07 UTCEG score recompute
  75. 2026-07-01 15:07 UTCEPSS rescore

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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 25.8% 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.

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