CVE-2023-25730

Name: CVE-2023-25730
Creator: NVD / NIST
Published: 2023-06-02T17:15:11.097+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2023-25730 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

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.

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

0.55%

41.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 110.0
Mozilla	Firefox Esr	< 102.8
Mozilla	Thunderbird	< 102.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1794622Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-07/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1794622Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-05/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-06/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-07/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1794622Issue Tracking, Permissions Required, Vendor Advisory

Timeline

Published: Jun 2, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-25730?

How severe is CVE-2023-25730?

CVE-2023-25730 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2023-25730?

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-2023-25730?

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

Scan your code now

Source: NVD / NIST