Vulnerability DatabaseCVE-2026-75588
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CVE-2026-75588
Published:September 17, 2026
Updated:September 22, 2026
Mattermost Desktop App versions <=6.2 6.2.2.0 fail to validate the URL scheme when checking whether a target URL is internal to the connected server, which allows a network-positioned attacker to load a plugin popout window over an insecure connection via a link using a downgraded URL scheme. Mattermost Advisory ID: MMSA-2026-00717
Affected Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=autoupdater__nightly-deploy_5.1.0-nightly.20220217 <v6.2.3
Fix Suggestion:
Update to version v6.2.3
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) =v6.3.0-rc.1 <v6.3.0-rc.2
Fix Suggestion:
Update to version v6.3.0-rc.2
Related Resources (1)
https://mattermost.com/security-updates
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CVSS v4
Base Score:
2.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.6
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Validation of Specified Type of Input
CWE-1287
EPSS
Base Score:
0.17