CVE-2022-29909

Name: CVE-2022-29909
Creator: NVD / NIST
Published: 2022-12-22T20:15:25.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.85%

Last modified Jun 17, 2026

CVE-2022-29909 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

Description

Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.85%

53.4th 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=1755081Issue 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/Mailing List
https://bugzilla.mozilla.org/show_bug.cgi?id=1755081Issue 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/Mailing List
https://bugzilla.mozilla.org/show_bug.cgi?id=1755081Issue Tracking, Permissions Required, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2022-29909?

How severe is CVE-2022-29909?

CVE-2022-29909 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2022-29909?

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-2022-29909?

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

Scan your code now

Source: NVD / NIST