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CVE-2026-10103 Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels

🗓️ 13 Jul 2026 07:57:11Reported by MattermostType 
cvelist
 cvelist
🔗 www.cve.org👁 6 Views

Authenticated remote cluster can modify or delete posts in shared channels via crafted sync messages with arbitrary post IDs.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
CVE
CVE-2026-10103
13 Jul 202607:57
cve
EUVD
EUVD-2026-43307
13 Jul 202609:31
euvd
NVD
CVE-2026-10103
13 Jul 202609:16
nvd
Positive Technologies
PT-2026-57654
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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