CVE-2026-9308

5.4 MEDIUM

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

Published: 2026-06-01 · Last updated: 2026-06-03

Severity and scoring

CVSS: 5.4 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CWE: CWE-79

Affected products

Vendor	Product
mozilla	firefox

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-9308
[Other]https://bugzilla.mozilla.org/show_bug.cgi?id=2039422
[Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-53/

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