What is GHSA-9mh4-36gv-g7wx?

GHSA-9mh4-36gv-g7wx is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.10.x \u003c= 11.10.0, 11.7.x \u003c= 11.7.9, 11.9.x \u003c= 11.9.1, 11.8.x \u003c= 11.8.5 fail...

Which CVE IDs does GHSA-9mh4-36gv-g7wx cover?

GHSA-9mh4-36gv-g7wx covers the following CVE IDs: CVE-2026-19621. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-9mh4-36gv-g7wx?

GHSA-9mh4-36gv-g7wx has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

GHSA-9mh4-36gv-g7wxMediumCVSS 6.5

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail...

Vendor

GitHub Security Advisories

Published

October 16, 2026

Last Modified

October 16, 2026

🔗 CVE IDs covered (1)

CVE-2026-19621 →

📋 Description

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain server-side webhook URLs and authentication context from interactive-message posts via the post_deleted websocket event or the threads REST API.. Mattermost Advisory ID: MMSA-2026-00766

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-19621
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-9mh4-36gv-g7wx