GHSA-mxq2-5jpg-7474

Source

https://github.com/advisories/GHSA-mxq2-5jpg-7474

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mxq2-5jpg-7474/GHSA-mxq2-5jpg-7474.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-mxq2-5jpg-7474

Aliases

Published

2026-06-22T15:30:45Z

Modified

2026-09-28T17:10:50Z

Severity

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

Summary

Mattermost doesn't validate channel ownership of an existing subscription before applying edits

Details

Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650

Database specific

{
    "cwe_ids":  [
        "CWE-639"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-15T19:50:42Z",
    "nvd_published_at":  "2026-06-22T14:17:51Z",
    "severity":  "MODERATE"
}

References

Affected packages

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

11.7.0

Fixed

11.7.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mxq2-5jpg-7474/GHSA-mxq2-5jpg-7474.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

11.6.0

Fixed

11.6.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mxq2-5jpg-7474/GHSA-mxq2-5jpg-7474.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

11.5.6

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mxq2-5jpg-7474/GHSA-mxq2-5jpg-7474.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

10.11.18

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-mxq2-5jpg-7474/GHSA-mxq2-5jpg-7474.json"