What is GHSA-rmvv-8v8w-rf7x?

GHSA-rmvv-8v8w-rf7x is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.6.x \u003c= 11.6.0, 11.5.x \u003c= 11.5.3, 11.4.x \u003c= 11.4.4, 10.11.x \u003c= 10.11.14...

Which CVE IDs does GHSA-rmvv-8v8w-rf7x cover?

GHSA-rmvv-8v8w-rf7x covers the following CVE IDs: CVE-2026-4646. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-rmvv-8v8w-rf7x?

GHSA-rmvv-8v8w-rf7x has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-rmvv-8v8w-rf7xMediumCVSS 4.3

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14...

Vendor

GitHub Security Advisories

Published

May 26, 2026

Last Modified

May 26, 2026

🔗 CVE IDs covered (1)

CVE-2026-4646 →

📋 Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate user-supplied input in API request handlers which allows an authenticated attacker to crash the plugin process via a crafted HTTP request to the PR details endpoint.. Mattermost Advisory ID: MMSA-2026-00638

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-4646
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-rmvv-8v8w-rf7x