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CVE-2026-90450 (GCVE-0-2026-90450)

Vulnerability from cvelistv5 – Published: 2026-09-11 21:50 – Updated: 2026-09-11 21:50
VLAI
Summary
The application's role-authorization lookup defaults to granting access when a request handler's name is not present in its table of role requirements, rather than defaulting to deny. Any request handler that is not explicitly registered in this table is reachable by any authenticated user regardless of their assigned role, and any newly added handler is fail-open by default until explicitly added to the table.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-863 - Incorrect authorization
Assigner
References
URL Tags
https://raw.githubusercontent.com/cisagov/CSAF/de… government-resourcevendor-advisory
Impacted products
Vendor Product Version CPE status
CISA Malcolm Affected: 0 , < v26.06.0 (custom)
Unaffected: v26.06.0
guessed Create a notification for this product.
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          "product": "Malcolm",
          "repo": "https://github.com/cisagov/Malcolm",
          "vendor": "CISA",
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              "version": "v26.06.0"
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            }
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          "value": "The application\u0027s role-authorization lookup defaults to granting access when a request handler\u0027s name is not present in its table of role requirements, rather than defaulting to deny. Any request handler that is not explicitly registered in this table is reachable by any authenticated user regardless of their assigned role, and any newly added handler is fail-open by default until explicitly added to the table."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "value": "GENERAL"
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          "descriptions": [
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              "description": "CWE-863 Incorrect authorization",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-09-11T21:50:11.417Z",
        "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
        "shortName": "icscert"
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      "references": [
        {
          "tags": [
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            "vendor-advisory"
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          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json"
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      ],
      "solutions": [
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          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cdiv\u003e\u003cdiv\u003eThe latest version of Malcolm (September 2026 or later) fixes these vulnerabilities. Affected users are encouraged to update their instance of Malcolm to the latest version.\u003c/div\u003e\u003c/div\u003e"
            }
          ],
          "value": "The latest version of Malcolm (September 2026 or later) fixes these vulnerabilities. Affected users are encouraged to update their instance of Malcolm to the latest version."
        }
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      "source": {
        "discovery": "UNKNOWN"
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    "assignerShortName": "icscert",
    "cveId": "CVE-2026-90450",
    "datePublished": "2026-09-11T21:50:11.417Z",
    "dateReserved": "2026-09-11T21:00:09.301Z",
    "dateUpdated": "2026-09-11T21:50:11.417Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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