CVE-2021-4140

Summary

It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://bugzilla.mozilla.org/show_bug.cgi?id=1746720 ↗

Additional information

• NVD record
• https://bugzilla.mozilla.org/show_bug.cgi?id=1746720Patch
• https://www.mozilla.org/security/advisories/mfsa2022-01/Advisory
• https://www.mozilla.org/security/advisories/mfsa2022-02/Advisory
• https://www.mozilla.org/security/advisories/mfsa2022-03/Advisory