GHSA-mh4x-rmrx-3hp4

Source

https://github.com/advisories/GHSA-mh4x-rmrx-3hp4

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-mh4x-rmrx-3hp4

Aliases

Published

2026-04-17T15:31:17Z

Modified

2026-06-25T23:11:44Z

Severity

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

Summary

Mattermost has session spoofing due to lack of single-use consumption of guest magic link tokens enforcement

Details

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests. Mattermost Advisory ID: MMSA-2026-00624.

Database specific

{
    "cwe_ids": [
        "CWE-367"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-28T22:57:43Z",
    "nvd_published_at": "2026-04-15T12:16:40Z",
    "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

8.0.0-20250721062209-4952acea88ce

Fixed

8.0.0-20250723052842-4cb8d8940332

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.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-rc1

Fixed

10.11.13

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.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-rc1

Fixed

11.5.0

Affected versions

11.*

11.5.0-rc1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.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

11.4.0-rc1

Fixed

11.4.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.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

11.3.0-rc1

Fixed

11.3.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-mh4x-rmrx-3hp4/GHSA-mh4x-rmrx-3hp4.json"