CVE-2025-25279

Security Advisory MMSA-2025-00430 / CVE-2025-25279 Résumé Après avoir téléversé un fichier dans Mattermost Boards, lorsque le paramètre fileId est modifié et que le tableau est copié, le fichier pointe désormais vers le fichier cible spécifié dans le paramètre et le télécharge. Versions concernée...

CVE-2026-9859 Mattermost Boards plugin didn’t enforce role-based authorization on board channel link allowing board editors to expose boards to arbitrary channels

Mattermost versions 11.7.x = 11.7.6, 10.11.x = 10.11.21, 11.8.x = 11.8.3 fail to enforce PermissionManageBoardRoles on the channelId field of the batch endpoint, which allows an authenticated board editor to relink any board they can edit to an arbitrary channel via a crafted PATCH request...

CVE-2026-9859 Mattermost Boards plugin didn’t enforce role-based authorization on board channel link allowing board editors to expose boards to arbitrary channels

Mattermost versions 11.7.x = 11.7.6, 10.11.x = 10.11.21, 11.8.x = 11.8.3 fail to enforce PermissionManageBoardRoles on the channelId field of the batch endpoint, which allows an authenticated board editor to relink any board they can edit to an arbitrary channel via a crafted PATCH request...

CVE-2026-9859

Mattermost Boards plugin (versions ≤11.7.6, ≤10.11.21, ≤11.8.3) fails to enforce PermissionManageBoardRoles on the batch endpoint's channelId field, allowing authenticated board editors to relink boards to arbitrary channels via crafted PATCH requests. CVSS 3.1 scores 6.5 (MEDIUM) for network-bas...

CVE-2026-10080 Boards plugin panics on WebSocket command with non-string field types

Mattermost versions 11.7.x = 11.7.6, 10.11.x = 10.11.21, 11.8.x = 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a customfocalboardSUBSCRIBETEAM message with a non-string teamId...

GO-2026-4782 Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications in github.com/mattermost/mattermost-plugin-boards

Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications in github.com/mattermost/mattermost-plugin-boards...

Mattermost Boards Plugin fails to implement authorisation checks on comment block modifications

Mattermost Plugins versions =11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559...

CVE-2023-40703

Mattermost fails to properly limit the characters allowed in different fields of a block in Mattermost Boards allowing a attacker to consume excessive resources, possibly leading to Denial of Service, by patching the field of a block using a specially crafted string...

GHSA-58W6-W55X-6WQ8 Mattermost fails to validate user permissions in Boards

Mattermost versions 10.11.x = 10.11.4, 10.5.x = 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does...

CVE-2025-13870 Unauthorized access and subscription vulnerability in Boards

Mattermost versions 10.11.x = 10.11.4, 10.5.x = 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does...

CVE-2025-12756 Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

Mattermost versions 11.0.x = 11.0.2, 10.12.x = 10.12.1, 10.11.x = 10.11.4, 10.5.x = 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users...

CVE-2025-12756 Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

Mattermost versions 11.0.x = 11.0.2, 10.12.x = 10.12.1, 10.11.x = 10.11.4, 10.5.x = 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users...

CVE-2025-12756 Insecure Direct Object Reference in Mattermost Boards Plugin Enables Unauthorised Comment Deletion

Mattermost versions 11.0.x = 11.0.2, 10.12.x = 10.12.1, 10.11.x = 10.11.4, 10.5.x = 10.5.12 fail to validate user permissions when deleting comments in Boards, which allows an authenticated user with the editor role to delete comments created by other users...

PT-2025-48544

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.0.0 through 11.0.2 Mattermost versions 10.5.0 through 10.5.12 Mattermost versions 10.11.0 through 10.11.4 Mattermost versions 10.12.0 through 10.12.1 Description The software does not properly check user permissions when...

EUVD-2021-24345

Malware in sbrugna...

EUVD-2021-24344

Malware in sbrugna...

EUVD-2023-0891

Malicious code in bioql PyPI...

EUVD-2023-44235

Malicious code in bioql PyPI...

GO-2025-3978 Mattermost boards plugin fails to restrict download access to files in github.com/mattermost/mattermost-plugin-boards

Mattermost boards plugin fails to restrict download access to files in github.com/mattermost/mattermost-plugin-boards...

Mattermost boards plugin fails to restrict download access to files

Mattermost versions 10.5.x = 10.5.8, 9.11.x = 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration...