CVE-2023-29533: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

A website could have obscured the fullscreen notification by using a combination of <code>window.open</code>, fullscreen requests, <code>window.name</code> assignments, and <code>setInterval</code> calls. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 112, Focus for Android < 112, Firefox ESR < 102.10, Firefox for Android < 112, and Thunderbird < 102.10.

Affected products

• Mozilla Firefox: before 112.0 (fixed in 112.0)
• Mozilla Firefox ESR: before 102.10 (fixed in 102.10)
• Mozilla Firefox Mobile: before 112.0 (fixed in 112.0)
• Mozilla Focus: before 112.0 (fixed in 112.0)
• Mozilla Thunderbird: before 102.10 (fixed in 102.10)

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