CVE-2026-7387Mattermost group syncable endpoints allow privilege escalation via scheme_admin
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No exploitation reported and no EPSS estimate yet.
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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
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Mattermost
- NVD analysis
- Analyzed
- Record last updated
- Jun 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Mattermost Mattermost mattermost:mattermost (from the name) | from 11.6.0 through 11.6.1; from 11.5.0 through 11.5.4; from 10.11.0 through 10.11.15; from 10.11.0 through 10.11.16; 11.7.0 not affected; 11.6.2 not affected; 11.5.5 not affected; 10.11.16 not affected; and 1 more ranges | CNA record |
mattermost mattermost_server mattermost:mattermost_server | from 10.11.0 before 10.11.17; from 11.5.0 before 11.5.5; from 11.6.0 before 11.6.2 | NVD |
References
- https://mattermost.com/security-updatesvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.