Mattermost versions 11.1.x <= 11.1.0, 11.0.x <= 11.0.5, 10.12.x <= 10.12.3, 10.11.x <= 10.11.7 fail to verify that post actions invoking /share-issue-publicly were created by the Jira plugin which allowed a malicious Mattermost user to exfiltrate Jira tickets when victim users interacted with affected posts
Exploitability
AV:NAC:LPR:LUI:RScope
S:CImpact
C:LI:NA:N4.1/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:NAccess Control