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Medium severity6.7NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-6739

CVE-2026-6739

Description

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

2
  • Mattermost/Mattermostinferred2 versions
    >=10.11.0,<=10.11.16 && >=11.5.0,<=11.5.4 && >=11.6.0,<=11.6.1+ 1 more
    • (no CPE)range: >=10.11.0,<=10.11.16 && >=11.5.0,<=11.5.4 && >=11.6.0,<=11.6.1
    • (no CPE)range: <= 11.6.1, <= 11.5.4, <= 10.11.16

Patches

Vulnerability mechanics

References

1

News mentions

1