CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-6689

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Fail to enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation (the check was only applied on update/patch), which allows an authenticated user holding PermissionCreateTeam but not PermissionInviteUser on the resulting team to configure invite-controlled team settings (make the team publicly joinable via open invite and/or constrain membership via allowed domains) that they are not permitted to set on an existing team via POST /api/v4/teams with allow_open_invite: true and/or a non-empty allowed_domains in the request body.. Mattermost Advisory ID: MMSA-2026-00655

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 4.7%

CVSS Severity

CVSS v3 Score 4.3

References

https://mattermost.com/security-updates

Products affected by CVE-2026-6689

Mattermost » Mattermost Server » Version: 10.11.0

cpe:2.3:a:mattermost:mattermost_server:10.11.0
Mattermost » Mattermost Server » Version: 10.11.1

cpe:2.3:a:mattermost:mattermost_server:10.11.1
Mattermost » Mattermost Server » Version: 10.11.10

cpe:2.3:a:mattermost:mattermost_server:10.11.10
Mattermost » Mattermost Server » Version: 10.11.11

cpe:2.3:a:mattermost:mattermost_server:10.11.11
Mattermost » Mattermost Server » Version: 10.11.12

cpe:2.3:a:mattermost:mattermost_server:10.11.12
Mattermost » Mattermost Server » Version: 10.11.13

cpe:2.3:a:mattermost:mattermost_server:10.11.13
Mattermost » Mattermost Server » Version: 10.11.14

cpe:2.3:a:mattermost:mattermost_server:10.11.14
Mattermost » Mattermost Server » Version: 10.11.15

cpe:2.3:a:mattermost:mattermost_server:10.11.15
Mattermost » Mattermost Server » Version: 10.11.16

cpe:2.3:a:mattermost:mattermost_server:10.11.16
Mattermost » Mattermost Server » Version: 10.11.2

cpe:2.3:a:mattermost:mattermost_server:10.11.2
Mattermost » Mattermost Server » Version: 10.11.3

cpe:2.3:a:mattermost:mattermost_server:10.11.3
Mattermost » Mattermost Server » Version: 10.11.4

cpe:2.3:a:mattermost:mattermost_server:10.11.4
Mattermost » Mattermost Server » Version: 10.11.5

cpe:2.3:a:mattermost:mattermost_server:10.11.5
Mattermost » Mattermost Server » Version: 10.11.6

cpe:2.3:a:mattermost:mattermost_server:10.11.6
Mattermost » Mattermost Server » Version: 10.11.7

cpe:2.3:a:mattermost:mattermost_server:10.11.7
Mattermost » Mattermost Server » Version: 10.11.8

cpe:2.3:a:mattermost:mattermost_server:10.11.8
Mattermost » Mattermost Server » Version: 10.11.9

cpe:2.3:a:mattermost:mattermost_server:10.11.9
Mattermost » Mattermost Server » Version: 11.5.0

cpe:2.3:a:mattermost:mattermost_server:11.5.0
Mattermost » Mattermost Server » Version: 11.5.1

cpe:2.3:a:mattermost:mattermost_server:11.5.1
Mattermost » Mattermost Server » Version: 11.5.2

cpe:2.3:a:mattermost:mattermost_server:11.5.2
Mattermost » Mattermost Server » Version: 11.5.3

cpe:2.3:a:mattermost:mattermost_server:11.5.3
Mattermost » Mattermost Server » Version: 11.5.4

cpe:2.3:a:mattermost:mattermost_server:11.5.4
Mattermost » Mattermost Server » Version: 11.6.0

cpe:2.3:a:mattermost:mattermost_server:11.6.0
Mattermost » Mattermost Server » Version: 11.6.1

cpe:2.3:a:mattermost:mattermost_server:11.6.1

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-6689

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