MS
Product
Mattermost Server
501
CVEs
0
On KEV
9.9
Max CVSS
15
New 30D
Severity mix
Critical 17High 86Medium 356Low 41
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Add Mattermost Server to your stack to get only the CVEs that touch what you run.
| CVE | CVSS | Published | Summary · affected versions |
|---|---|---|---|
| CVE-2017-18918 | 4.9 | Jun 19 | An issue was discovered in Mattermost Server before 3.7.3 and 3.6.5 Affected: 3.6.0 before 3.6.5; 3.7.0 before 3.7.3 |
| CVE-2017-18876 | 4.9 | Jun 19 | An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used Affected: before 4.1.2; 4.2.0 before 4.2.1; 4.3.0; 4.3.0; 4.3.0; 4.3.0 |
| CVE-2017-18875 | 4.9 | Jun 19 | An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2 when local storage for files is used Affected: before 4.1.2; 4.2.0 before 4.2.1; 4.3.0; 4.3.0; 4.3.0; 4.3.0 |
| CVE-2026-3495 | 4.8 | May 18 | Unescaped variables during error page composition Affected: 10.11.0 before 10.11.14; 11.5.0 before 11.5.2 |
| CVE-2024-48872 | 4.8 | Dec 16 | Bypass of "Max failed attempts" restriction via race condition Affected: 9.5.0 before 9.5.13; 9.11.0 before 9.11.5; 10.0.0 before 10.0.3; 10.1.0 before 10.1.3 |
| CVE-2024-36250 | 4.8 | Nov 9 | MFA Code Replay Affected: 9.5.0 before 9.5.11; 9.11.0 before 9.11.3 |
| CVE-2026-27659 | 4.6 | Mar 25 | CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint Affected: 10.11.0 before 10.11.11; 11.2.0 before 11.2.3; 11.3.0 before 11.3.2; 11.4.0 before 11.4.1 |
| CVE-2024-46872 | 4.6 | Oct 29 | Client-Side Path Traversal Leading to CSRF in Playbooks Affected: 9.5.0 through 9.5.9; 9.10.0 through 9.10.2; 9.11.0 through 9.11.1 |
| CVE-2022-1385 | 4.6 | Apr 19 | Mattermost 6.4.x and earlier fails to properly invalidate pending email invitations when the action is performed from the system console, which allows accidentally invited users… Affected: before 6.5.0 |
| CVE-2026-18799 | 4.3 | Oct 16 | Mattermost Server fails to restrict Slack import account binding, allowing team admins to forge posts as existing users Affected: 11.7.0 before 11.7.10; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 |
| CVE-2026-18256 | 4.3 | Oct 16 | Private team metadata disclosure via the team search API Affected: 11.7.0 before 11.7.10; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 |
| CVE-2026-18560 | 4.3 | Oct 16 | Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status Affected: 11.7.0 before 11.7.10; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 |
| CVE-2026-19603 | 4.3 | Oct 16 | Private channel ID disclosure via user status endpoints Affected: 11.7.0 before 11.7.11; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 before 11.10.2 |
| CVE-2026-19867 | 4.3 | Oct 16 | Uncapped mention keys in user notification properties allow CPU exhaustion during post processing Affected: 11.7.0 before 11.7.11; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 |
| CVE-2026-95666 | 4.3 | Sep 22 | Unbounded post ID array in the bulk reactions endpoint allows denial of service Affected: 11.7.0 before 11.7.11; 11.8.0 before 11.8.6; 11.9.0 before 11.9.2; 11.10.0 before 11.10.2 |
| CVE-2026-86348 | 4.3 | Sep 14 | MS Calendar plugin: unrecovered handler panics from malformed post-action requests could crash the plugin process Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-86349 | 4.3 | Sep 14 | Mattermost Server Algorithmic DoS via Unbounded Markdown Block Nesting Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.9; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-13417 | 4.3 | Sep 14 | Boards plugin denial of service via unvalidated block fields.properties Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-10542 | 4.3 | Sep 14 | Playbooks channel action update validation issue Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-14344 | 4.3 | Sep 14 | Inconsistent authorization checks in Mattermost Boards endpoints Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-12882 | 4.3 | Sep 14 | Mattermost Markdown autolink parsing denial of service Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-11993 | 4.3 | Sep 14 | Fix authenticated members disabling file content indexing server-wide via extraction pool exhaustion Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-14259 | 4.3 | Sep 14 | Board archive import bypasses team board creation permissions Affected: 10.11.0 before 10.11.23; 11.7.0 before 11.7.8; 11.8.0 before 11.8.5; 11.9.0 before 11.9.1 |
| CVE-2026-16045 | 4.3 | Aug 17 | Delegated OAuth tokens could revoke unrelated OAuth application authorizations Affected: 10.11.0 before 10.11.22; 11.7.0 before 11.7.7 |
| CVE-2026-16047 | 4.3 | Aug 17 | Board channel linking without read channel permission validation Affected: 10.11.0 before 10.11.22; 11.7.0 before 11.7.7; 11.8.0 before 11.8.4 |
| CVE-2026-16046 | 4.3 | Aug 17 | Missing run-state validation on finished playbook runs Affected: 10.11.0 before 10.11.22; 11.7.0 before 11.7.7 |
| CVE-2026-10600 | 4.3 | Jul 27 | Denial of service via unbounded document content extraction in Mattermost Server Affected: 10.11.0 before 10.11.21; 11.6.0 before 11.6.6; 11.7.0 before 11.7.4; 11.8.0 before 11.8.1 |
| CVE-2026-6541 | 4.3 | Jul 13 | Unscoped updates to other playbooks' metric configuration Affected: 10.11.0 before 10.11.20; 11.6.0 before 11.6.5; 11.7.0 before 11.7.2 |
| CVE-2026-9824 | 4.3 | Jul 13 | Remote cluster metadata enumeration via /share-channel autocomplete Affected: 10.11.0 before 10.11.20; 11.6.0 before 11.6.5; 11.7.0 before 11.7.3 |
| CVE-2026-10103 | 4.3 | Jul 13 | Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels Affected: 10.11.0 before 10.11.20; 11.6.0 before 11.6.5; 11.7.0 before 11.7.3 |
| CVE-2026-9162 | 4.3 | Jun 22 | Global session revocation does not invalidate active WebSocket connections Affected: 10.11.0 before 10.11.18; 11.5.0 before 11.5.6; 11.6.0 before 11.6.3; 11.7.0 before 11.7.1 |
| CVE-2026-6689 | 4.3 | Jun 12 | *Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings* Affected: 10.11.0 before 10.11.17; 11.5.0 before 11.5.5; 11.6.0 before 11.6.2 |
| CVE-2026-3433 | 4.3 | Jun 12 | Mattermost fails to scope role_updated websocket events to authorized team and channel members Affected: 10.11.0 before 10.11.17; 11.5.0 before 11.5.5; 11.6.0 before 11.6.2 |
| CVE-2026-4646 | 4.3 | May 22 | Insufficient input validation in GitHub plugin API causes denial of service Affected: 10.11.0 before 10.11.15; 11.4.0 before 11.4.5; 11.5.0 before 11.5.4; 11.6.0 before 11.6.1 |
| CVE-2026-3636 | 4.3 | May 22 | Sanitize team member data returned by API Affected: 10.11.0 before 10.11.15; 11.4.0 before 11.4.5; 11.5.0 before 11.5.4; 11.6.0 before 11.6.1 |
| CVE-2026-4055 | 4.3 | May 21 | Insufficient permission validation on cross-team playbook run creation Affected: 10.11.0 before 10.11.17; 11.5.0 before 11.5.5; 11.6.0 before 11.6.2 |
| CVE-2026-28732 | 4.3 | May 18 | Slash command trigger-word update allowed command hijacking Affected: 10.11.0 before 10.11.14; 11.4.0 before 11.4.4; 11.5.0 before 11.5.2 |
| CVE-2026-6343 | 4.3 | May 18 | Mattermost Playbooks Plugin fails to enforce view permissions in list endpoints, allowing unauthorized access to public playbooks Affected: 10.11.0 before 10.11.14; 11.4.0 before 11.4.4; 11.5.0 before 11.5.2 |
| CVE-2026-4286 | 4.3 | May 18 | Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update Affected: 10.11.0 before 10.11.14; 11.5.0 before 11.5.2 |
| CVE-2026-6339 | 4.3 | May 18 | Missing request origin validation on burn-on-read reveal endpoint Affected: 11.4.0 before 11.4.4; 11.5.0 before 11.5.2 |
| CVE-2026-6341 | 4.3 | May 18 | Incomplete group locking implementation Affected: 10.13.0 through 10.13.11; 11.1.0 through 11.1.5; 11.3.0 through 11.3.4 |
| CVE-2026-6342 | 4.3 | May 18 | Group prefix matching bypass for subscriptions Affected: 10.13.0 through 10.13.11; 11.1.0 through 11.1.5; 11.3.0 through 11.3.4 |
| CVE-2026-4273 | 4.3 | May 18 | Insufficient token rotation validation in remote cluster invite confirmation Affected: 10.11.0 before 10.11.14; 11.5.0 before 11.5.2 |
| CVE-2026-3637 | 4.3 | May 18 | Mattermost fails to enforce create_post permission when editing posts Affected: 10.11.0 before 10.11.14; 11.4.0 before 11.4.4; 11.5.0 before 11.5.2 |
| CVE-2026-28759 | 4.3 | May 18 | Insufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channels Affected: 10.11.0 before 10.11.14; 11.4.0 before 11.4.4; 11.5.0 before 11.5.2 |
| CVE-2026-4053 | 4.3 | May 15 | post edit time limit is not enforced on some post update operations Affected: 10.11.0 before 10.11.14; 11.5.0 before 11.5.2 |
| CVE-2026-3115 | 4.3 | Mar 26 | Guest users can view group member IDs without respecting view restrictions Affected: 10.11.0 before 10.11.11; 11.2.0 before 11.2.3; 11.3.0 before 11.3.2; 11.4.0 |
| CVE-2026-1629 | 4.3 | Mar 16 | Permalink Preview Information Disclosure After Permission Revocation Affected: 10.11.0 before 10.11.11 |
| CVE-2026-26304 | 4.3 | Mar 16 | Permission Bypass in Playbook Run Creation Affected: 11.2.0 before 11.2.3; 11.3.0 before 11.3.1 |
| CVE-2026-24692 | 4.3 | Mar 16 | Guest users can bypass read permissions via search API Affected: 10.11.0 before 10.11.11; 11.2.0 before 11.2.3; 11.3.0 before 11.3.1 |
The 500 most important CVEs for this product (exploited first, then by severity)