CVE-2026-40189

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-10. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload files with PUT, upload files with multipart POST /upload, create directories with ?mkdir, and delete files with ?delete inside a .goshs-protected directory. By deleting the .goshs file itself, the attacker can remove the folder's auth policy and then access previously protected content without credentials. This results in a critical authorization bypass affecting confidentiality, integrity, and availability. This vulnerability is fixed in 2.0.0-beta.4.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

April 10, 2026

Last Modified

April 14, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

File-based ACL authorization bypass in goshs state-changing routes · Advisory · goshs-labs/goshs · GitHub

https://github.com/patrickhener/goshs/security/advisories/GHSA-wvhv-qcqf-f3cx
github_release Patch Available

v2.0.0-beta.4

Patch available: patrickhener/goshs v2.0.0-beta.4

https://github.com/patrickhener/goshs/releases/tag/v2.0.0-beta.4
github_commit

commit f212c4f4a126 (patrickhener/goshs)

Fix landed in patrickhener/goshs commit f212c4f4a126 — awaiting tagged release

https://github.com/patrickhener/goshs/commit/f212c4f4a126556bab008f79758e21a839ef2c0f

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/patrickhener/goshs—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

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/patrickhener/goshs———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 28× 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 224 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40189?
CVE-2026-40189 is a critical vulnerability published on April 10, 2026. goshs is a SimpleHTTPServer written in Go. Prior to 2.0.0-beta.4, goshs enforces the documented per-folder .goshs ACL/basic-auth mechanism for directory listings and file reads, but it does not enforce the same authorization checks for state-changing routes. An unauthenticated attacker can upload…
When was CVE-2026-40189 disclosed?
CVE-2026-40189 was first published in the National Vulnerability Database on April 10, 2026, with the most recent update on April 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40189 actively exploited?
CVE-2026-40189 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 51.1% of all scored CVEs.
What is the CVSS score of CVE-2026-40189?
CVE-2026-40189 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-40189?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40189, 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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