CVE-2026-9308

5.4 mediumEPSS 0.2%

Medium (5.4) in mozilla firefox. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-06-01
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2039422
https://www.mozilla.org/security/advisories/mfsa2026-53/

Check your stack JSON