What is GHSA-vqp5-2mrp-qqxg?

GHSA-vqp5-2mrp-qqxg is a security advisory published by GitHub Security Advisories with Low severity. Mattermost versions 11.5.x \u003c= 11.5.1, 10.11.x \u003c= 10.11.13 fail to validate the Host header when...

Which CVE IDs does GHSA-vqp5-2mrp-qqxg cover?

GHSA-vqp5-2mrp-qqxg covers the following CVE IDs: CVE-2026-6333. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-vqp5-2mrp-qqxg?

GHSA-vqp5-2mrp-qqxg has a CVSS v3 base score of 3.5, published by GitHub Security Advisories.

GHSA-vqp5-2mrp-qqxgLowCVSS 3.5

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when...

Vendor

GitHub Security Advisories

Published

May 18, 2026

Last Modified

May 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-6333 →

📋 Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to validate the Host header when constructing response URLs for custom slash commands which allows an authenticated attacker to redirect slash command responses to an attacker-controlled server via a spoofed Host header.. Mattermost Advisory ID: MMSA-2026-00582

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-6333
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-vqp5-2mrp-qqxg