Vulnerability DatabaseCVE-2026-3108
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CVE-2026-3108
March 26, 2026
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to sanitize user-controlled post content in the mmctl commands terminal output which allows attackers to manipulate administrator terminals via crafted messages containing ANSI and OSC escape sequences that enable screen manipulation, fake prompts, and clipboard hijacking.. Mattermost Advisory ID: MMSA-2026-00599
Affected Packages
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.12
Fix Suggestion:
Update to version v10.11.12
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.3.0 <v11.3.2
Fix Suggestion:
Update to version v11.3.2
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.3.0 <v11.3.2
Fix Suggestion:
Update to version v11.3.2
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.12
Fix Suggestion:
Update to version v10.11.12
github.com/mattermost/mattermost (GO):
Affected version(s) =v11.4.0 <v11.4.1
Fix Suggestion:
Update to version v11.4.1
github.com/mattermost/mattermost (GO):
Affected version(s) =v11.4.0 <v11.4.1
Fix Suggestion:
Update to version v11.4.1
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.2.0 <v11.2.4
Fix Suggestion:
Update to version v11.2.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.2.0 <v11.2.4
Fix Suggestion:
Update to version v11.2.4
Related Resources (1)
https://mattermost.com/security-updates
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CVSS v4
Base Score:
8.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Escape, Meta, or Control Sequences
CWE-150
EPSS
Base Score:
0.04