Mattermost Mobile Apps versions <=2.16.0 fail to protect against abuse of a globally shared MathJax state which allows an attacker to change the contents of a LateX post, by creating another post with specific macro definitions.
Exploitability
AV:NAC:HPR:LUI:RScope
S:UImpact
C:NI:LA:N2.6/CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:NOther