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CVE-2026-16047

🗓️ 17 Aug 2026 14:25:08Reported by MattermostType 
cve
 cve
🔗 web.nvd.nist.gov👁 55 Views

Mattermost fails to validate channel read access before board linking, exposing private channel membership to authenticated users.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-16047
17 Aug 202614:25
–attackerkb
cvelist
Cvelist
CVE-2026-16047 Board channel linking without read channel permission validation
17 Aug 202614:25
–cvelist
euvd
EUVD
EUVD-2026-60208
17 Aug 202614:25
–euvd
mend
Mend
CVE-2026-16047
17 Aug 202614:25
–mend
ncsc
NCSC
Vulnerabilities in Mattermost
19 Aug 202606:34
–ncsc
nvd
NVD
CVE-2026-16047
17 Aug 202615:16
–nvd
osv_mini
osv_mini
MINI-CH24-67JQ-R659
19 Aug 202613:48
–osv_mini
osv_mini
osv_mini
MINI-M82W-5VW2-J756
19 Aug 202613:48
–osv_mini
ptsecurity
Positive Technologies
PT-2026-76661
17 Aug 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-16047: Missing Authorization
17 Aug 202600:00
–rapid7
Rows per page
NVD
Vulners
Node
OR
mattermostmattermost_serverRange10.11.0–10.11.22
mattermostmattermost_serverRange11.7.0–11.7.7
mattermostmattermost_serverRange11.8.0–11.8.4
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.7.6",
        "status": "affected",
        "version": "11.7.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "10.11.21",
        "status": "affected",
        "version": "10.11.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.8.3",
        "status": "affected",
        "version": "11.8.0",
        "versionType": "semver"
      },
      {
        "version": "11.9.0",
        "status": "unaffected"
      },
      {
        "version": "11.7.7",
        "status": "unaffected"
      },
      {
        "version": "10.11.22",
        "status": "unaffected"
      },
      {
        "version": "11.8.4",
        "status": "unaffected"
      }
    ]
  }
]

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18 Aug 2026 20:41Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.3
EPSS0.0027
SSVC
55