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CVE-2020-15676 Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in…

Description

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 81 earliest → < 81 81
Thunderbird 78.3 earliest → < 78.3 78.3
Firefox ESR 78.3 earliest → < 78.3 78.3
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