What is GHSA-hg9w-cw2v-4pm9?

GHSA-hg9w-cw2v-4pm9 is a security advisory published by GitHub Security Advisories with Critical severity. Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox...

Which CVE IDs does GHSA-hg9w-cw2v-4pm9 cover?

GHSA-hg9w-cw2v-4pm9 covers the following CVE IDs: CVE-2026-84140. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-hg9w-cw2v-4pm9?

GHSA-hg9w-cw2v-4pm9 has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

GHSA-hg9w-cw2v-4pm9CriticalCVSS 9.8

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox...

Vendor

GitHub Security Advisories

Published

September 1, 2026

Last Modified

September 3, 2026

🔗 CVE IDs covered (1)

CVE-2026-84140 →

📋 Description

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

🔗 References (7)

https://nvd.nist.gov/vuln/detail/CVE-2026-84140
https://bugzilla.mozilla.org/show_bug.cgi?id=2063780
https://www.mozilla.org/security/advisories/mfsa2026-82
https://www.mozilla.org/security/advisories/mfsa2026-85
https://www.mozilla.org/security/advisories/mfsa2026-86
https://www.mozilla.org/security/advisories/mfsa2026-88
https://github.com/advisories/GHSA-hg9w-cw2v-4pm9