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CVE-2026-4274

🗓️ 26 Mar 2026 10:43:24Reported by MattermostType 
cve
 cve
🔗 web.nvd.nist.gov👁 1 Views

remote clusters can grant team access during membership sync, exposing private team access.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-4274
26 Mar 202610:43
attackerkb
Circl
CVE-2026-3109
27 Mar 202603:00
circl
Circl
CVE-2026-3112
27 Mar 202603:00
circl
Circl
CVE-2026-3113
27 Mar 202603:00
circl
Circl
CVE-2026-3114
27 Mar 202603:00
circl
Circl
CVE-2026-3115
27 Mar 202603:00
circl
Circl
CVE-2026-3116
27 Mar 202603:00
circl
Circl
CVE-2026-4274
16 Apr 202611:35
circl
CNNVD
Mattermost 安全漏洞
26 Mar 202600:00
cnnvd
Cvelist
CVE-2026-4274 Insufficient authorization in shared channel membership sync grants team-level access instead of channel-level access
26 Mar 202610:43
cvelist
Rows per page
NVD
Node
mattermostmattermost_serverRange10.11.010.11.11
OR
mattermostmattermost_serverRange11.2.011.2.3
OR
mattermostmattermost_serverRange11.3.011.3.2
OR
mattermostmattermost_serverRange11.4.011.4.1
[
  {
    "defaultStatus": "unaffected",
    "product": "Mattermost",
    "vendor": "Mattermost",
    "versions": [
      {
        "lessThanOrEqual": "11.2.2",
        "status": "affected",
        "version": "11.2.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "10.11.10",
        "status": "affected",
        "version": "10.11.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.4.0",
        "status": "affected",
        "version": "11.4.0",
        "versionType": "semver"
      },
      {
        "lessThanOrEqual": "11.3.1",
        "status": "affected",
        "version": "11.3.0",
        "versionType": "semver"
      },
      {
        "version": "11.5.0",
        "status": "unaffected"
      },
      {
        "version": "11.2.3",
        "status": "unaffected"
      },
      {
        "version": "10.11.11",
        "status": "unaffected"
      },
      {
        "version": "11.4.1",
        "status": "unaffected"
      },
      {
        "version": "11.3.2",
        "status": "unaffected"
      }
    ]
  }
]

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26 Mar 2026 18:48Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.4
EPSS0.0004
SSVC
1