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Cross-site Scripting (XSS) The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)

Threat Intelligence

EPSS
1.27% (79th percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1013291
  • published26 Sept 2020
  • disclosed1 Oct 2020
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Introduced: 26 Sep 2020

CVE-2020-15676  (opens in a new tab)
CWE-79  (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.

Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.