CVE-2026-85390

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-03. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

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

Checkmate through 3.11.0 omits the isAllowed role guard middleware on maintenance-window, notification, and check-deletion routes, allowing read-only users to perform administrative actions. Attackers with user-role sessions can create arbitrary maintenance windows to silence alerts, modify notification channels, and delete monitor check history to erase incident evidence.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

September 3, 2026

Last Modified

September 10, 2026

Advisory Details (6)

Auto-updated Sep 3, 2026
No patch confirmed yet.
generic

Checkmate through 3.11.0 Missing Authorization on Maintenance Window, Notification, and Check Deletion Routes | Advisories | VulnCheck

https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes
generic

Checkmate/server/src/api/routes/checkRoutes.ts at v3.11.0 · bluewave-labs/Checkmate · GitHub

https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts
generic

Checkmate/server/src/api/routes/notificationRoutes.ts at v3.11.0 · bluewave-labs/Checkmate · GitHub

https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts
generic

Checkmate/server/src/api/routes/maintenanceWindowRoutes.ts at v3.11.0 · bluewave-labs/Checkmate · GitHub

https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts
generic

GitHub - bluewave-labs/Checkmate: Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Don't be shy, join here: https://discord.com/invite/NAb6H3UTjK :) · GitHub

https://github.com/bluewave-labs/Checkmate
generic

User-role can create/modify/delete maintenance windows, status pages, notifications, and erase check history · Issue #3916 · bluewave-labs/Checkmate · GitHub

https://github.com/bluewave-labs/Checkmate/issues/3916

Vendor Advisories for CVE-2026-85390(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 84× 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. 2026-09-25 05:09 UTCGHSA enrichment
  2. 2026-09-24 16:44 UTCEG score recompute
  3. 2026-09-24 16:44 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 04:03 UTCEG score recompute
  6. 2026-09-24 04:03 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 15:38 UTCGHSA enrichment
  9. 2026-09-23 03:12 UTCEG score recompute
  10. 2026-09-23 03:12 UTCGHSA enrichment
  11. 2026-09-22 16:01 UTCEPSS rescore
  12. 2026-09-22 14:47 UTCGHSA enrichment
  13. 2026-09-22 02:21 UTCEG score recompute
  14. 2026-09-22 02:21 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 13:56 UTCGHSA enrichment
  17. 2026-09-21 01:31 UTCEG score recompute
  18. 2026-09-21 01:31 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 12:44 UTCGHSA enrichment
  21. 2026-09-20 00:19 UTCEG score recompute
  22. 2026-09-20 00:19 UTCGHSA enrichment
  23. 2026-09-19 11:54 UTCGHSA enrichment
  24. 2026-09-18 23:26 UTCEG score recompute
  25. 2026-09-18 23:26 UTCGHSA enrichment
Show 59 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 11:02 UTCGHSA enrichment
  3. 2026-09-17 22:37 UTCEG score recompute
  4. 2026-09-17 22:36 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 10:08 UTCGHSA enrichment
  7. 2026-09-16 21:43 UTCEG score recompute
  8. 2026-09-16 21:43 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 09:18 UTCEG score recompute
  11. 2026-09-16 09:18 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 20:53 UTCGHSA enrichment
  14. 2026-09-15 08:20 UTCEG score recompute
  15. 2026-09-15 08:20 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 19:55 UTCGHSA enrichment
  19. 2026-09-14 07:30 UTCGHSA enrichment
  20. 2026-09-13 19:05 UTCEG score recompute
  21. 2026-09-13 19:05 UTCGHSA enrichment
  22. 2026-09-13 06:40 UTCGHSA enrichment
  23. 2026-09-12 18:16 UTCEG score recompute
  24. 2026-09-12 18:16 UTCGHSA enrichment
  25. 2026-09-12 05:51 UTCGHSA enrichment
  26. 2026-09-11 17:26 UTCEG score recompute
  27. 2026-09-11 17:26 UTCGHSA enrichment
  28. 2026-09-11 14:53 UTCEPSS rescore
  29. 2026-09-11 14:53 UTCEPSS rescore
  30. 2026-09-11 04:25 UTCGHSA enrichment
  31. 2026-09-10 16:00 UTCGHSA enrichment
  32. 2026-09-10 12:21 UTCEG score recompute
  33. 2026-09-10 12:21 UTCGHSA enrichment
  34. 2026-09-09 23:56 UTCGHSA enrichment
  35. 2026-09-09 11:31 UTCGHSA enrichment
  36. 2026-09-08 23:06 UTCEG score recompute
  37. 2026-09-08 23:06 UTCGHSA enrichment
  38. 2026-09-08 22:01 UTCEPSS rescore
  39. 2026-09-08 05:56 UTCGHSA enrichment
  40. 2026-09-07 17:31 UTCGHSA enrichment
  41. 2026-09-07 05:06 UTCGHSA enrichment
  42. 2026-09-06 16:41 UTCEG score recompute
  43. 2026-09-06 16:41 UTCGHSA enrichment
  44. 2026-09-06 13:48 UTCEPSS rescore
  45. 2026-09-06 04:16 UTCGHSA enrichment
  46. 2026-09-05 15:49 UTCEG score recompute
  47. 2026-09-05 15:49 UTCGHSA enrichment
  48. 2026-09-05 15:31 UTCEPSS rescore
  49. 2026-09-05 03:23 UTCEG score recompute
  50. 2026-09-05 03:23 UTCGHSA enrichment
  51. 2026-09-05 02:30 UTCEG score recompute
  52. 2026-09-05 02:30 UTCGHSA enrichment
  53. 2026-09-04 20:11 UTCEG score recompute
  54. 2026-09-04 20:10 UTCGHSA enrichment
  55. 2026-09-04 07:44 UTCEG score recompute
  56. 2026-09-04 07:44 UTCGHSA enrichment
  57. 2026-09-03 19:19 UTCEG score recompute
  58. 2026-09-03 18:59 UTCEG score recompute
  59. 2026-09-03 18:58 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85390?
CVE-2026-85390 is a high vulnerability published on September 3, 2026. Checkmate through 3.11.0 omits the isAllowed role guard middleware on maintenance-window, notification, and check-deletion routes, allowing read-only users to perform administrative actions. Attackers with user-role sessions can create arbitrary maintenance windows to silence alerts, modify…
When was CVE-2026-85390 disclosed?
CVE-2026-85390 was first published in the National Vulnerability Database on September 3, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85390 actively exploited?
CVE-2026-85390 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.9% of all scored CVEs.
What is the CVSS score of CVE-2026-85390?
CVE-2026-85390 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-85390?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85390, 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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