CVE-2026-9308

Name: CVE-2026-9308
Creator: NVD / NIST
Published: 2026-06-01T13:16:33.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2026-9308 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.16%

5.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 151.2

References

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

Timeline

Published: Jun 1, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-9308?

How severe is CVE-2026-9308?

CVE-2026-9308 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2026-9308?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-9308?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST