Mattermost doesn't require system-level permission when patching protected default system roles
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 system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API. Mattermost Advisory ID: MMSA-2026-00656
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-6739US | high7.2OT 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 fail to require system-level permission when patching protected default system role… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/mattermost/mattermostPACKAGE
- https://github.com/mattermost/mattermost/commit/2c89c2f6768fbe4dfd57a21ca38c0aecead8d4a8WEB
- https://github.com/mattermost/mattermost/commit/5e159647b16e571b327ac6882f32eae42971f540WEB
- https://github.com/mattermost/mattermost/commit/8000e5933526f4fd66b92131db3a1b1f4520dbaeWEB
- https://github.com/mattermost/mattermost/commit/f0a390b96e4c730daedbaf5190684776730218c7WEB
- https://github.com/mattermost/mattermost/pull/36197WEB
- https://github.com/mattermost/mattermost/pull/36377WEB
- https://github.com/mattermost/mattermost/pull/36379WEB
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