CVE-2022-22743

Name: CVE-2022-22743
Creator: NVD / NIST
Published: 2022-12-22T20:15:15.157+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2022-22743 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.64%

46.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 96.0
Mozilla	Firefox Esr	< 91.5
Mozilla	Thunderbird	< 91.5

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1739220Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2022-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-03/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1739220Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2022-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-03/Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-22743?

How severe is CVE-2022-22743?

CVE-2022-22743 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2022-22743?

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-2022-22743?

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

Scan your code now

Source: NVD / NIST