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CVE-2025-27715
Good to know:

Date: March 21, 2025
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
Severity Score
Severity Score
Weakness Type (CWE)
Incorrect Authorization
CWE-863Top Fix

Upgrade Version
Upgrade to version https://github.com/mattermost/mattermost.git - v9.11.9
CVSS v3.1
Base Score: |
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Attack Vector (AV): | NETWORK |
Attack Complexity (AC): | HIGH |
Privileges Required (PR): | HIGH |
User Interaction (UI): | NONE |
Scope (S): | UNCHANGED |
Confidentiality (C): | LOW |
Integrity (I): | LOW |
Availability (A): | NONE |