CVE-2022-31738

Name: CVE-2022-31738
Creator: NVD / NIST
Published: 2022-12-22T20:15:28.373+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2022-31738 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

When exiting fullscreen mode, an iframe could have confused the browser about the current state of fullscreen, resulting in potential user confusion or spoofing attacks. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.58%

43.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 101
Mozilla	Firefox Esr	< 91.10
Mozilla	Thunderbird	< 91.10

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1756388Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1756388Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-21/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-22/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1756388Issue Tracking, Permissions Required, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2022-31738?

How severe is CVE-2022-31738?

CVE-2022-31738 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31738?

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-2022-31738?

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

Scan your code now

Source: NVD / NIST