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CVE-2026-82920

🗓️ 14 Sep 2026 13:59:01Reported by MattermostType 
cve
 cve
🔗 web.nvd.nist.gov👁 26 Views🌐 WEB

Mattermost 11.7-11.9 ABAC parent policy bypass via policy update endpoint by channel or team admin.

Related
Detection
Affected
Refs
Paths
Vulners
Node
OR
mattermostmattermostRange≤11.9.0
mattermostmattermostRange≤11.8.4
mattermostmattermostRange≤11.7.7
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.9.0",
        "status": "affected",
        "version": "11.9.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.8.4",
        "status": "affected",
        "version": "11.8.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.7.7",
        "status": "affected",
        "version": "11.7.0",
        "versionType": "semver"
      },
      {
        "version": "11.10.0",
        "status": "unaffected"
      },
      {
        "version": "11.9.1",
        "status": "unaffected"
      },
      {
        "version": "11.8.5",
        "status": "unaffected"
      },
      {
        "version": "11.7.8",
        "status": "unaffected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
importsrequest body/api/v4/access_control_policiesAuthorization boundary bypass via update of access_control_policies using an empty imports list to detach a system ABAC parent policy.CWE-863

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16 Sep 2026 19:30Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.5
EPSS0.00255
SSVC
26