Vulnerability-Lookup

CVE-2026-85390 (GCVE-0-2026-85390)

Vulnerability from cvelistv5 – Published: 2026-09-03 18:54 – Updated: 2026-09-05 02:01

Title

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

Summary

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.

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-05 02:01 UTC

CWE

CWE-862 - Missing Authorization

Assigner

VulnCheck mitre root

References

6 references

URL	Tags
https://github.com/bluewave-labs/Checkmate/issues/3916	issue-tracking
https://github.com/bluewave-labs/Checkmate	product
https://github.com/bluewave-labs/Checkmate/blob/v…	technical-description
https://github.com/bluewave-labs/Checkmate/blob/v…	technical-description
https://github.com/bluewave-labs/Checkmate/blob/v…	technical-description
https://www.vulncheck.com/advisories/checkmate-th…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
bluewave-labs	Checkmate	Affected: 0 , ≤ 3.11.0 (semver) cpe:2.3:a:bluewavelabs:checkmate::::::::

Date Public

2026-09-03 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-85390

Vulnerability from fkie_nvd - Published: 2026-09-03 19:17 - Updated: 2026-09-03 19:17

Severity

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/bluewave-labs/Checkmate
	disclosure@vulncheck.com	https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts
	disclosure@vulncheck.com	https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts
	disclosure@vulncheck.com	https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts
	disclosure@vulncheck.com	https://github.com/bluewave-labs/Checkmate/issues/3916
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Primary"
    }
  ]
}

GHSA-8CVG-RXFW-4PF6

Vulnerability from github – Published: 2026-09-03 21:31 – Updated: 2026-09-03 21:31

Details

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-85390"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-03T19:17:30Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-8cvg-rxfw-4pf6",
  "modified": "2026-09-03T21:31:15Z",
  "published": "2026-09-03T21:31:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85390"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate/issues/3916"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-85390 (GCVE-0-2026-85390)

FKIE_CVE-2026-85390

GHSA-8CVG-RXFW-4PF6

Tags

Sightings

Nomenclature