CVE-2023-29540: Mozilla Firefox

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Using a redirect embedded into <code>sourceMappingUrls</code> could allow for navigation to external protocol links in sandboxed iframes without <code>allow-top-navigation-to-custom-protocols</code>. This vulnerability affects Firefox for Android < 112, Firefox < 112, and Focus for Android < 112.

Affected products

• Mozilla Firefox: before 112.0 (fixed in 112.0)
• Mozilla Firefox Mobile: before 112.0 (fixed in 112.0)
• Mozilla Focus: before 112.0 (fixed in 112.0)

Published 2023-06-02. Last modified 2026-08-19.