mattermost Vulnerability Advisory Catalog

Total 602 security vulnerabilities recorded for mattermost software and firmware.

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CVE-2026-6689 MEDIUM
Component: mattermost_server

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 Fail to enforce PermissionInviteUser when setting All...

📅 2026-06-12
CVSS 4.3 Dossier →
CVE-2026-6046 MEDIUM
Component: mattermost_server

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 fail to validate that a username returned during bot ...

📅 2026-06-12
CVSS 5.3 Dossier →
CVE-2026-3433 MEDIUM
Component: mattermost_server

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 fail to restrict role_updated websocket event broadca...

📅 2026-06-12
CVSS 4.3 Dossier →
Component: legal_hold

Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, ...

📅 2026-05-27
CVSS 8.0 Dossier →
CVE-2026-4915 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing webhook attach...

📅 2026-05-25
CVSS 6.5 Dossier →
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate the OAuth token scope on the callback w...

📅 2026-05-22
CVSS 5.4 Dossier →
CVE-2026-5755 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.2, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate the TIFF IFD offset i...

📅 2026-05-22
CVSS 6.5 Dossier →
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to properly validate msgpack-encoded WebSocket fram...

📅 2026-05-22
CVSS 7.5 Dossier →
CVE-2026-5308 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to enforce request body size limits on plugin HTTP ...

📅 2026-05-22
CVSS 4.9 Dossier →
CVE-2026-4646 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request hand...

📅 2026-05-22
CVSS 4.3 Dossier →
CVE-2026-4635 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to archive the channel before removing persistent n...

📅 2026-05-22
CVSS 6.5 Dossier →
CVE-2026-3636 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to sanitize team member data when returned via API ...

📅 2026-05-22
CVSS 4.3 Dossier →
CVE-2026-3473 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, whic...

📅 2026-05-22
CVSS 5.9 Dossier →
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which a...

📅 2026-05-21
CVSS 8.0 Dossier →
CVE-2026-4055 MEDIUM
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allo...

📅 2026-05-21
CVSS 4.3 Dossier →
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields in the Mattermost Calls pl...

📅 2026-05-18
CVSS 7.6 Dossier →
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to sanitize sensitive configuration fields before including them in s...

📅 2026-05-18
CVSS 8.7 Dossier →
CVE-2026-6345 MEDIUM
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail prevent disclosure of created user password which allows a malicious ...

📅 2026-05-18
CVSS 6.5 Dossier →
CVE-2026-6343 MEDIUM
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without thes...

📅 2026-05-18
CVSS 4.3 Dossier →
CVE-2026-6339 MEDIUM
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 11.4.x <= 11.4.3 fail to validate the X-Requested-With header on the burn-on-read reveal endpoint which allows a...

📅 2026-05-18
CVSS 4.3 Dossier →
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands w...

📅 2026-05-18
CVSS 3.5 Dossier →
CVE-2026-5163 MEDIUM
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated atta...

📅 2026-05-18
CVSS 6.5 Dossier →
Component: mattermost_desktop

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Matter...

📅 2026-05-18
CVSS 3.5 Dossier →
Component: mattermost_server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with ...

📅 2026-05-18
CVSS 3.1 Dossier →
Page 2 of 26 (602 Total Records)