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CVE-2026-9708 Incoming webhook user attribution via unvalidated webhook owner

🗓️ 13 Jul 2026 08:00:10Reported by MattermostType 
cvelist
 cvelist
🔗 www.cve.org👁 5 Views

CVE-2026-9708: Incoming webhook user attribution fails validation, letting a webhook manager post as another user.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
CVE
CVE-2026-9708
13 Jul 202608:00
cve
EUVD
EUVD-2026-43308
13 Jul 202609:31
euvd
NVD
CVE-2026-9708
13 Jul 202609:16
nvd
Positive Technologies
PT-2026-57664
13 Jul 202600:00
ptsecurity
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.7.2",
        "status": "affected",
        "version": "11.7.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.6.4",
        "status": "affected",
        "version": "11.6.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "10.11.19",
        "status": "affected",
        "version": "10.11.0",
        "versionType": "semver"
      },
      {
        "version": "11.8.0",
        "status": "unaffected"
      },
      {
        "version": "11.7.3",
        "status": "unaffected"
      },
      {
        "version": "11.6.5",
        "status": "unaffected"
      },
      {
        "version": "10.11.20",
        "status": "unaffected"
      }
    ]
  }
]

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