Описание
Mattermost doesn't verify channel membership when processing AI-assisted message rewrites
Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645
Пакеты
github.com/mattermost/mattermost/server/v8
>= 11.5.0, < 11.5.2
11.5.2
github.com/mattermost/mattermost/server/v8
< 8.0.0-20260401090745-f4d1abe7e8f5
8.0.0-20260401090745-f4d1abe7e8f5
github.com/mattermost/mattermost-server
< 5.3.2-0.20260401090745-f4d1abe7e8f5
5.3.2-0.20260401090745-f4d1abe7e8f5
Связанные уязвимости
Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership when processing AI-assisted message rewrites which allows an authenticated attacker to read the content of threads in private channels and direct messages they do not have access to via a crafted request to the post rewrite endpoint.. Mattermost Advisory ID: MMSA-2026-00645
Mattermost versions 11.5.x <= 11.5.1 fail to verify channel membership ...