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CVE-2021-23969 The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)

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EPSS
1.16% (78th percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1080086
  • published27 Feb 2021
  • disclosed26 Feb 2021
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Introduced: 26 Feb 2021

CVE-2021-23969  (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.

As specified in the W3C Content Security Policy draft, when creating a violation report, "User agents need to ensure that the source file is the URL requested by the page, pre-redirects. If that’s not possible, user agents need to strip the URL down to an origin to avoid unintentional leakage." Under certain types of redirects, Firefox incorrectly set the source file to be the destination of the redirects. This was fixed to be the redirect destination's origin. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.