What is GHSA-j76w-p754-g2w7?

GHSA-j76w-p754-g2w7 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.5.x \u003c= 11.5.1, 10.11.x \u003c= 10.11.13, 11.4.x \u003c= 11.4.3 Fail to validate the...

Which CVE IDs does GHSA-j76w-p754-g2w7 cover?

GHSA-j76w-p754-g2w7 covers the following CVE IDs: CVE-2026-4054. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-j76w-p754-g2w7?

GHSA-j76w-p754-g2w7 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-j76w-p754-g2w7MediumCVSS 4.3

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to validate the...

Vendor

GitHub Security Advisories

Published

May 15, 2026

Last Modified

May 15, 2026

🔗 CVE IDs covered (1)

CVE-2026-4054 →

📋 Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to validate the response body of proxied images, which allows a remote attacker to enact client-side DoS via an SVG file served from an attacker-controlled origin under a non-SVG Content-Type header (e.g. image/png) embedded in an og:image meta tag or Markdown image link.. Mattermost Advisory ID: MMSA-2026-00630

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-4054
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-j76w-p754-g2w7