Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests. Mattermost Advisory ID: MMSA-2026-00665
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-7387US | —OT elevated | — | ||
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to require role-management authorization when setting the scheme_a… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/mattermost/mattermostPACKAGE
- https://github.com/mattermost/mattermost/commit/1ce2484a00c9821ee19708d2c46720e4855033a9WEB
- https://github.com/mattermost/mattermost/commit/202d125afa87fe39611686850fd82590c99ca344WEB
- https://github.com/mattermost/mattermost/commit/8c72083414e675c97987374395e36d1f36b4bd8aWEB
- https://github.com/mattermost/mattermost/commit/a9e574a82633915f22071f0d7ca2b006f249ec2aWEB
- https://github.com/mattermost/mattermost/commit/d5f29c8ebbeb04460d16d9e2635ce50deeb78428WEB
- https://github.com/mattermost/mattermost/pull/36316WEB
- https://github.com/mattermost/mattermost/pull/36423WEB
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