What is GHSA-42ff-p8fr-h5jr?

GHSA-42ff-p8fr-h5jr is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.7.x \u003c= 11.7.2, 11.6.x \u003c= 11.6.4 fail to verify whether a guest account is...

Which CVE IDs does GHSA-42ff-p8fr-h5jr cover?

GHSA-42ff-p8fr-h5jr covers the following CVE IDs: CVE-2026-9597. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-42ff-p8fr-h5jr?

GHSA-42ff-p8fr-h5jr has a CVSS v3 base score of 5.4, published by GitHub Security Advisories.

GHSA-42ff-p8fr-h5jrMediumCVSS 5.4

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is...

Vendor

GitHub Security Advisories

Published

July 13, 2026

Last Modified

July 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-9597 →

📋 Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-9597
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-42ff-p8fr-h5jr