What is GHSA-h55j-6jm9-f8vp?

GHSA-h55j-6jm9-f8vp is a security advisory published by GitHub Security Advisories with Medium severity. Firefox for iOS Reader View replaced page content in its HTML template before replacing other...

Which CVE IDs does GHSA-h55j-6jm9-f8vp cover?

GHSA-h55j-6jm9-f8vp covers the following CVE IDs: CVE-2026-9308. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-h55j-6jm9-f8vp?

GHSA-h55j-6jm9-f8vp has a CVSS v3 base score of 5.4, published by GitHub Security Advisories.

GHSA-h55j-6jm9-f8vpMediumCVSS 5.4

Firefox for iOS Reader View replaced page content in its HTML template before replacing other...

Vendor

GitHub Security Advisories

Published

June 1, 2026

Last Modified

June 1, 2026

🔗 CVE IDs covered (1)

CVE-2026-9308 →

📋 Description

Firefox for iOS Reader View replaced page content in its HTML template before replacing other internal placeholders. A malicious page could include a placeholder string that was later substituted with JSON-LD data, potentially resulting in arbitrary JavaScript execution. This vulnerability was fixed in Firefox for iOS 151.2.

🔗 References (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-9308
https://bugzilla.mozilla.org/show_bug.cgi?id=2039422
https://www.mozilla.org/security/advisories/mfsa2026-53
https://github.com/advisories/GHSA-h55j-6jm9-f8vp