Mattermost doesn't enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation
CVSS score
4.3
EPSS probability
%0.3
Risk score
0.0
Published
4 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-6689 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
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
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-6689 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | go | github.com/mattermost/mattermost-server | View |
| 2 | go | github.com/mattermost/mattermost-server | View |
| 3 | go | github.com/mattermost/mattermost-server | View |
| 4 | go | github.com/mattermost/mattermost/server/v8 | View |
| 5 | go | github.com/mattermost/mattermost-server | View |
| 6 | go | github.com/mattermost/mattermost-server/v5 | View |
| 7 | go | github.com/mattermost/mattermost-server/v6 | View |
| 8 | go | github.com/mattermost/mattermost/server/v8 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 4.3 | CVSS 3.x | — | Vector not published | GitHub Advisory |
| 0.0 | CVSS 4.0 | — | Vector not published | GitHub Advisory |
Patch and Remediation Guide
Solution & Remediation Advisory
4 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
10.11.17+incompatibleOSV düzeltilmiş sürüm: 10.11.17+incompatible
11.5.5+incompatibleOSV düzeltilmiş sürüm: 11.5.5+incompatible
11.6.1+incompatibleOSV düzeltilmiş sürüm: 11.6.1+incompatible
8.0.0-20260501144115-7d6816abdfd1OSV düzeltilmiş sürüm: 8.0.0-20260501144115-7d6816abdfd1
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-6689 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-6689 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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