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Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints

🗓️ 12 Jun 2026 18:31:59Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 7 Views

Missing role-management authorization in Mattermost allows escalation to team or channel admin.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
circl
Circl		CVE-2026-7387
2 Jul 202619:07
–circl
cve
CVE		CVE-2026-7387
12 Jun 202615:54
–cve
cvelist
Cvelist		CVE-2026-7387 Mattermost group syncable endpoints allow privilege escalation via scheme_admin
12 Jun 202615:54
–cvelist
euvd
EUVD		EUVD-2026-36503
12 Jun 202615:54
–euvd
nessus
Tenable Nessus		Mattermost Server 10.11.x < 10.11.16 / 11.5.x < 11.5.5 / 11.6.x < 11.6.2 Multiple Vulnerabilities (MMSA-2026-00616 / MMSA-2026-00649 / MMSA-2026-00655 / MMSA-2026-00656 / MMSA-2026-00661 / MMSA-2026-00662 / MMSA-2026-00665)
18 Jun 202600:00
–nessus
nvd
NVD		CVE-2026-7387
12 Jun 202617:16
–nvd
osv
OSV		GHSA-6HXM-W4HV-VGVW Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints
12 Jun 202618:31
–osv
osv
OSV		GO-2026-6280 Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints in github.com/mattermost/mattermost-server
25 Aug 202619:43
–osv
ptsecurity
Positive Technologies		PT-2026-48941
12 Jun 202600:00
–ptsecurity
ptsecurity
Positive Technologies		PT-2026-82029
25 Aug 202600:00
–ptsecurity
Rows per page
Vulners
Node
OR
mattermostmattermostRange8.0.0-20250731163400-5b955468ea1e–8.0.0-20260506065351-202d125afa87go
mattermostmattermost-serverRange10.11.0–10.11.15go
mattermostmattermost-serverRange11.5.0–11.5.4go
mattermostmattermost-servergo

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24 Aug 2026 21:51Current
5.2Medium risk
Vulners AI Score5.2
CVSS 3.18.8
EPSS0.0031
SSVC
CWE-863
Mattermostprivilege escalationmissing authorizationscheme_admin flaggroup syncable
7