CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AI Score
Confidence
High
github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is due to improper validation of remote server requests in shared channels with multiple connected remote servers, allowing a malicious remote server to change the profile images of users belonging to another remote server. Attackers can exploit this by requesting another remote server to update user profile pictures without proper verification.