CVE-2026-9708

creationtimestamp| type| source ---|---|--- 2026-07-13 09:41:10+00:00| seen| https://bsky.app/profile/cve.skyfleet.blue/post/3mqjflymjrr25 2026-07-13 09:51:01+00:00| seen| https://bsky.app/profile/qiancx.bsky.social/post/3mqjg5lvm5z2d 2026-07-13 09:51:01+00:00| seen|...

CVE-2026-9708 Incoming webhook user attribution via unvalidated webhook owner

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 target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via...