What is GHSA-rp4v-qc77-phm4?

GHSA-rp4v-qc77-phm4 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.6.x \u003c= 11.6.1, 11.5.x \u003c= 11.5.4, 10.11.x \u003c= 10.11.15, 10.11.x \u003c= 10.11.16...

Which CVE IDs does GHSA-rp4v-qc77-phm4 cover?

GHSA-rp4v-qc77-phm4 covers the following CVE IDs: CVE-2026-3433. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-rp4v-qc77-phm4?

GHSA-rp4v-qc77-phm4 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-rp4v-qc77-phm4MediumCVSS 4.3

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16...

Vendor

GitHub Security Advisories

Published

June 12, 2026

Last Modified

June 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-3433 →

📋 Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-3433
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-rp4v-qc77-phm4