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CVE-2026-28759 Insufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channels
| Reporter | Title | Published | Views | Family All 14 |
|---|---|---|---|---|
 | CVE-2026-28759 | 18 May 202606:50 | – | attackerkb |
 | CVE-2026-28759 | 18 May 202608:34 | – | circl |
 | Mattermost 安全漏洞 | 18 May 202600:00 | – | cnnvd |
 | CVE-2026-28759 | 18 May 202606:50 | – | cve |
 | EUVD-2026-30738 | 18 May 202606:50 | – | euvd |
 | Mattermost does not verify remote cluster channel access when processing shared channel membership removals | 18 May 202609:31 | – | github |
 | Mattermost Server 10.11.x <= 10.11.13 / 11.4.x <= 11.4.3 / 11.5.x <= 11.5.1 Multiple Vulnerabilities (MMSA-2026-00573 / MMSA-2026-00576 / MMSA-2026-00591 / MMSA-2026-00605 / MMSA-2026-00607 / MMSA-2026-00608 / MMSA-2026-00614 / MMSA-2026-00627) | 22 May 202600:00 | – | nessus |
 | CVE-2026-28759 | 18 May 202608:16 | – | nvd |
 | GHSA-8H9W-W78C-VVR3 Mattermost does not verify remote cluster channel access when processing shared channel membership removals | 18 May 202609:31 | – | osv |
 | PT-2026-41640 | 18 May 202600:00 | – | ptsecurity |
10
[
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "11.5.1",
"status": "affected",
"version": "11.5.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "10.11.13",
"status": "affected",
"version": "10.11.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.4.3",
"status": "affected",
"version": "11.4.0",
"versionType": "semver"
},
{
"version": "11.6.0",
"status": "unaffected"
},
{
"version": "11.5.2",
"status": "unaffected"
},
{
"version": "10.11.14",
"status": "unaffected"
},
{
"version": "11.4.4",
"status": "unaffected"
}
]
}
]| Source | Link |
|---|---|
| mattermost | www.mattermost.com/security-updates |
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18 May 2026 06:50Current
CVSS 3.14.3
EPSS0.00152