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Incorrect Authorization The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)

Threat Intelligence

EPSS
1.03% (77th percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1910279
  • published3 Nov 2021
  • disclosed8 Dec 2021
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Introduced: 3 Nov 2021

CVE-2021-38503  (opens in a new tab)
CWE-863  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Ubuntu.

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.