CVE-2026-7387
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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_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
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.6.0 <= 11.6.1 | affected |
| Mattermost | Mattermost | 11.5.0 <= 11.5.4 | affected |
| Mattermost | Mattermost | 10.11.0 <= 10.11.15 | affected |
| Mattermost | Mattermost | 10.11.0 <= 10.11.16 | affected |
| Mattermost | Mattermost | 11.7.0 | unaffected |
| Mattermost | Mattermost | 11.6.2 | unaffected |
| Mattermost | Mattermost | 11.5.5 | unaffected |
| Mattermost | Mattermost | 10.11.16 | unaffected |
| Mattermost | Mattermost | 10.11.17 | unaffected |
Weaknesses
- CWE-863: CWE-863: Incorrect Authorization
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.