Описание
Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow. Mattermost Advisory ID: MMSA-2026-00590
Пакеты
github.com/mattermost/mattermost-server
>= 11.4.0-rc1, < 11.4.1
11.4.1
github.com/mattermost/mattermost-server
>= 11.3.0-rc1, < 11.3.2
11.3.2
github.com/mattermost/mattermost-server
>= 11.2.0-rc1, < 11.2.4
11.2.4
github.com/mattermost/mattermost-server
>= 10.11.0-rc1, < 10.11.2
10.11.12
github.com/mattermost/mattermost/server/v8
>= 8.0.0-20260105080200-d27a2195068d, < 8.0.0-20260217110922-b7d4a1f1f59b
8.0.0-20260217110922-b7d4a1f1f59b
Связанные уязвимости
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2 ...