CVE-2020-15676: Debian Linux

Medium severity, CVSS 6.1. EPSS: 1.6% chance of exploitation in the next 30 days.

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

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Mozilla Firefox: before 81.0 (fixed in 81.0)
• Mozilla Firefox ESR: before 78.3 (fixed in 78.3)
• Mozilla Thunderbird: before 78.3 (fixed in 78.3)
• Opensuse Leap: version 15.1 only; version 15.2 only

Published 2020-10-01. Last modified 2026-06-17.