Mattermost Server
467 CVEs tracked. None of them is in CISA KEV.
This hub aggregates every CVE we track for Mattermost Server, a product in the communications space. Use it to gauge the current risk picture and drill into individual advisories.
Mattermost Server CVEs per month
| Month | CVEs |
|---|---|
| 2024-10 | 4 |
| 2024-11 | 4 |
| 2024-12 | 4 |
| 2025-01 | 7 |
| 2025-02 | 6 |
| 2025-03 | 7 |
| 2025-04 | 13 |
| 2025-05 | 9 |
| 2025-06 | 7 |
| 2025-07 | 3 |
| 2025-08 | 9 |
| 2025-09 | 6 |
| 2025-10 | 6 |
| 2025-11 | 10 |
| 2025-12 | 10 |
| 2026-01 | 2 |
| 2026-02 | 8 |
| 2026-03 | 32 |
| 2026-04 | 4 |
| 2026-05 | 32 |
| 2026-06 | 15 |
| 2026-07 | 13 |
| 2026-08 | 12 |
| 2026-09 | 0 |
Severity
How the 467 CVEs score on CVSS. Severity is not exploitation: KEV is counted above.
- Critical17
- High64
- Medium296
- Low90
Latest CVEs
The 15 most recently published vulnerabilities affecting Mattermost Server.
- CVE-2026-9693Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite3.5
- CVE-2026-9859Mattermost Boards plugin didn’t enforce role-based authorization on board channel link allowing board editors to expose boards to arbitrary channels6.5
- CVE-2026-9816Insufficient server-side validation of board member role fields permits privilege escalation8.3
- CVE-2026-10080Boards plugin panics on WebSocket command with non-string field types6.5
- CVE-2026-10527Boards plugin retains Board Admin rights for users demoted to System Guest6.3
- CVE-2026-15754Missing per-channel team-scope check in ABAC access control policy unassign allows cross-team policy removal4.2
- CVE-2026-16044Insufficient validation of guest board admin privileges on archive import5.4
- CVE-2026-16045Delegated OAuth tokens could revoke unrelated OAuth application authorizations4.3
- CVE-2026-16047Board channel linking without read channel permission validation4.3
- CVE-2026-16046Missing run-state validation on finished playbook runs4.3
- CVE-2026-16048Channel member roles accept out-of-scope roles6.3
- CVE-2026-14298Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost6.5
- CVE-2026-7521SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory5.5
- CVE-2026-10819Mattermost Server Denial of Service via Animated GIF Emoji Upload6.5
- CVE-2026-10600Denial of service via unbounded document content extraction in Mattermost Server4.3
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