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CVE-2026-90452 (GCVE-0-2026-90452)

Vulnerability from cvelistv5 – Published: 2026-09-11 21:51 – Updated: 2026-09-11 21:51
VLAI
Summary
Requests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider's server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment.
Severity
6 (Medium)
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-295 - Improper certificate validation
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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  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Malcolm",
          "repo": "https://github.com/cisagov/Malcolm",
          "vendor": "CISA",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "custom"
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              "version": "v26.06.0"
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              "value": "\u003cdiv\u003e\u003cdiv\u003eRequests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider\u0027s server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment.\u003c/div\u003e\u003c/div\u003e"
            }
          ],
          "value": "Requests from the reverse proxy to the identity-provider service for token discovery, introspection, and credential exchange do not verify the identity provider\u0027s server certificate. An attacker positioned on the network path between the proxy and the identity provider could impersonate the identity provider and issue forged authentication tokens accepted by the deployment."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 6,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "value": "GENERAL"
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      "problemTypes": [
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              "description": "CWE-295 Improper certificate validation",
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              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-09-11T21:51:08.628Z",
        "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
        "shortName": "icscert"
      },
      "references": [
        {
          "tags": [
            "government-resource",
            "vendor-advisory"
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          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json"
        }
      ],
      "solutions": [
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          "lang": "en",
          "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."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
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      "x_generator": {
        "engine": "Vulnogram 1.0.5"
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  "cveMetadata": {
    "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
    "assignerShortName": "icscert",
    "cveId": "CVE-2026-90452",
    "datePublished": "2026-09-11T21:51:08.628Z",
    "dateReserved": "2026-09-11T21:00:09.301Z",
    "dateUpdated": "2026-09-11T21:51:08.628Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}



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