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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 2026 18:31:59Reported by GoogleType 
osv
 osv🔗 osv.dev👁 3 Views

Mattermost missing role-management authorization on scheme_admin flag allows privilege escalation.

Related
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
github
Github Security Blog		Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints
12 Jun 202618:31
–github
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		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
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26 Aug 2026 01:21Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.18.8
EPSS0.0031
Mattermostmissing authorizationprivilege escalationscheme_admin flaggroup syncable
3