mattermost Vulnerability Advisory Catalog

Total 602 security vulnerabilities recorded for mattermost software and firmware.

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CVE-2026-9824 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel ...

📅 2026-07-13
CVSS 4.3 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user wit...

📅 2026-07-13
CVSS 3.8 Dossier →
CVE-2026-6541 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved,...

📅 2026-07-13
CVSS 4.3 Dossier →
CVE-2026-9708 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the ...

📅 2026-07-13
CVSS 4.9 Dossier →
CVE-2026-9597 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-li...

📅 2026-07-13
CVSS 5.4 Dossier →
CVE-2026-9571 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, wh...

📅 2026-07-13
CVSS 5.9 Dossier →
CVE-2026-6850 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values...

📅 2026-07-13
CVSS 6.5 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the...

📅 2026-07-13
CVSS 6.5 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, ...

📅 2026-07-13
CVSS 4.3 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict the group_constrained channel flag to public and private ...

📅 2026-07-13
CVSS 5.4 Dossier →
CVE-2026-4339 MEDIUM
Component: mattermost_server

Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to validate attachment URLs against internal or private IP ranges in ...

📅 2026-06-26
CVSS 6.5 Dossier →
Component: mattermost_server

Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot too...

📅 2026-06-26
CVSS 3.5 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged a...

📅 2026-06-22
CVSS 3.8 Dossier →
CVE-2026-9162 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for activ...

📅 2026-06-22
CVSS 4.3 Dossier →
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to enforce bot-specific permission checks on the user active status endpoint, which all...

📅 2026-06-22
CVSS 3.8 Dossier →
CVE-2026-6673 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbac...

📅 2026-06-22
CVSS 6.4 Dossier →
CVE-2026-6062 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscr...

📅 2026-06-22
CVSS 6.4 Dossier →
CVE-2026-5139 MEDIUM
Component: mattermost_server

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{set...

📅 2026-06-22
CVSS 5.4 Dossier →
CVE-2026-8683 MEDIUM
Component: mattermost_desktop

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a...

📅 2026-06-15
CVSS 6.5 Dossier →
CVE-2026-6517 MEDIUM
Component: mattermost_desktop

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermos...

📅 2026-06-15
CVSS 6.3 Dossier →
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 Mattermost fails to require role-management authoriza...

📅 2026-06-12
CVSS 8.8 Dossier →
CVE-2026-7184 MEDIUM
Component: mattermost_server

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15 fail to sanitize the Remote Cluster API response on PATCH operations, whic...

📅 2026-06-12
CVSS 6.5 Dossier →
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 Mattermost fails to sanitize FileInfo.Name received f...

📅 2026-06-12
CVSS 7.6 Dossier →
CVE-2026-6739 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 require system-level permission when patching...

📅 2026-06-12
CVSS 6.7 Dossier →
Page 1 of 26 (602 Total Records)