What is GHSA-7ggq-hqj4-w5vc?

GHSA-7ggq-hqj4-w5vc is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.9.x \u003c= 11.9.1, 11.8.x \u003c= 11.8.5, 11.7.x \u003c= 11.7.10, 11.10.x \u003c= 11.10.1...

Which CVE IDs does GHSA-7ggq-hqj4-w5vc cover?

GHSA-7ggq-hqj4-w5vc covers the following CVE IDs: CVE-2026-19603. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-7ggq-hqj4-w5vc?

GHSA-7ggq-hqj4-w5vc has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-7ggq-hqj4-w5vcMediumCVSS 4.3

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1...

Vendor

GitHub Security Advisories

Published

October 16, 2026

Last Modified

October 16, 2026

🔗 CVE IDs covered (1)

CVE-2026-19603 →

📋 Description

Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize the active channel field returned by the user status API endpoints, which allows an authenticated user to learn the channel ID of a private channel another user is actively viewing via the status endpoints, without being a member of that channel. Mattermost Advisory ID: MMSA-2026-00765

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-19603
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-7ggq-hqj4-w5vc