CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
AI Score
Confidence
High
EPSS
Percentile
20.1%
github.com/mattermost/mattermost-server is vulnerable to Improper Access Control. The vulnerability is due to the failure to disallow unsolicited invites when shared channels are enabled, This allowing an attacker to send an invite with the ID of an existing local channel, causing that local channel to become shared without the consent of the local admin.