Detections
Analytics

SCA: security update for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8 (GHSA-c28q-m4gf-vg4q)

medium Tenable Self-Hosted Container Security Plugin ID 446262

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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 (CVE-2026-6689)

Solution

Update the github.com/mattermost/mattermost-server library and its related packages to version 10.11.17 or later.

See Also

https://github.com/advisories/GHSA-c28q-m4gf-vg4q

Plugin Details

Severity: Medium

ID: 446262

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 8/25/2026

Updated: 8/25/2026

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2026-6689

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/12/2026

Vulnerability Publication Date: 6/12/2026

Reference Information

CVE: CVE-2026-6689

cwe: CWE-862