GHSA-g7fp-cqj5-x8hf

Source

https://github.com/advisories/GHSA-g7fp-cqj5-x8hf

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-g7fp-cqj5-x8hf

Aliases

Published

2026-03-26T12:30:29Z

Modified

2026-06-25T19:56:02Z

Severity

5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

Mattermost has an Incorrect Authorization issue

Details

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared channel via sending crafted membership sync messages that trigger team membership assignment. Mattermost Advisory ID: MMSA-2026-00574

Database specific

{
    "cwe_ids":  [
        "CWE-863"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-03-31T23:01:25Z",
    "nvd_published_at":  "2026-03-26T11:16:21Z",
    "severity":  "MODERATE"
}

References

Affected packages

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

11.4.0-rc1

Fixed

11.4.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.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

11.3.0-rc1

Fixed

11.3.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.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

11.2.0-rc1

Fixed

11.2.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.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

10.11.0-rc1

Fixed

10.11.11

Database specific

last_known_affected_version_range

"< 10.11.1"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.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

8.0.0-20260105080200-d27a2195068d

Fixed

8.0.0-20260217110922-b7d4a1f1f59b

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.json"