CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:NMattermost 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 channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
Multiple vulnerabilities have been discovered in Mattermost Server, potentially allowing an attacker to cause a security issue not specified by the vendor. These vulnerabilities could lead to data integrity and confident…