CVE-2022-29911

Name: CVE-2022-29911
Creator: NVD / NIST
Published: 2022-12-22T20:15:25.803+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2022-29911 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An improper implementation of the new iframe sandbox keyword <code>allow-top-navigation-by-user-activation</code> could lead to script execution without <code>allow-scripts</code> being present. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

An improper implementation of the new iframe sandbox keyword <code>allow-top-navigation-by-user-activation</code> could lead to script execution without <code>allow-scripts</code> being present. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.56%

42.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 100.0
Mozilla	Firefox Esr	< 91.9
Mozilla	Thunderbird	< 91.9

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1761981Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-17/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1761981Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-17/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2022-29911?

How severe is CVE-2022-29911?

CVE-2022-29911 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2022-29911?

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-2022-29911?

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

Scan your code now

Source: NVD / NIST