CVE-2023-25730

A background script invoking <code>requestFullscreen</code> and then blocking the main thread could force the browser into fullscreen mode indefinitely, resulting in potential user confusion or spoofing attacks. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

CVSS 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-1021

Published

2023-06-02

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

Affected

• mozilla:firefox
• mozilla:firefox_esr
• mozilla:thunderbird

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1794622
• https://www.mozilla.org/security/advisories/mfsa2023-05/
• https://www.mozilla.org/security/advisories/mfsa2023-06/
• https://www.mozilla.org/security/advisories/mfsa2023-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1794622

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