GHSA-6hxm-w4hv-vgvw

Suggest an improvement
Source
https://github.com/advisories/GHSA-6hxm-w4hv-vgvw
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-6hxm-w4hv-vgvw
Aliases
Published
2026-06-12T18:31:59Z
Modified
2026-08-25T20:25:45Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints
Details

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 require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests. Mattermost Advisory ID: MMSA-2026-00665

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-24T21:51:47Z",
    "nvd_published_at": "2026-06-12T17:16:27Z",
    "severity": "HIGH"
}
References

Affected packages

Go
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.6.0
Fixed
11.6.1

Affected versions

11.*
11.6.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.5.0
Fixed
11.5.5

Database specific

last_known_affected_version_range 
"<= 11.5.4"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
10.11.0
Fixed
10.11.17

Database specific

last_known_affected_version_range 
"<= 10.11.15"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"
github.com/mattermost/mattermost/server/v8

Package

Name
github.com/mattermost/mattermost/server/v8
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type
SEMVER
Events
Introduced
8.0.0-20250731163400-5b955468ea1e
Fixed
8.0.0-20260506065351-202d125afa87

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"