CVE-2026-9816
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
Insufficient server-side validation of board member role fields permits privilege escalation
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate BoardMember.Scheme* fields server-side on insert and archive-import paths which allows a board editor or non-guest team member to grant board admin to arbitrary users via POST /api/v2/boards/{boardID}/members and POST /api/v2/teams/{teamID}/archive/import.. Mattermost Advisory ID: MMSA-2026-00685
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Mattermost
- Vendor
- Mattermost
- Product
- Mattermost
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 11.7.0 | affected | semver | Unavailable | 11.7.6 | None listed |
| 10.11.0 | affected | semver | Unavailable | 10.11.21 | None listed |
| 11.8.0 | affected | semver | Unavailable | 11.8.3 | None listed |
| 11.9.0 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.7.7 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 10.11.22 | unaffected | Unavailable | Unavailable | Unavailable | None listed |
| 11.8.4 | unaffected | Unavailable | Unavailable | Unavailable | None listed |