p PatchFirst

CVE-2020-26951

CVE-2020-26951

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

CVSS 6.1 · Medium · EPSS 1.1% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • firefox

    Versions
    • < 83: Affected

    No fix published

  • firefox esr

    Versions
    • < 78.5: Affected

    No fix published

  • thunderbird

    Versions
    • < 78.5: Affected

    No fix published

  • firefox-esr Debian:12

    Affected ranges
    • ECOSYSTEM: < 78.5.0esr-1

    Update to 78.5.0esr-1

  • firefox-esr Debian:13

    Affected ranges
    • ECOSYSTEM: < 78.5.0esr-1

    Update to 78.5.0esr-1

  • firefox-esr Debian:14

    Affected ranges
    • ECOSYSTEM: < 78.5.0esr-1

    Update to 78.5.0esr-1

  • thunderbird Debian:12

    Affected ranges
    • ECOSYSTEM: < 1:78.5.0-1

    Update to 1:78.5.0-1

  • thunderbird Debian:13

    Affected ranges
    • ECOSYSTEM: < 1:78.5.0-1

    Update to 1:78.5.0-1

  • thunderbird Debian:14

    Affected ranges
    • ECOSYSTEM: < 1:78.5.0-1

    Update to 1:78.5.0-1

  • firefox Ubuntu:16.04:LTS

    Versions
    • 41.0.2+build2-0ubuntu1
    • 42.0+build2-0ubuntu1
    • 44.0+build3-0ubuntu2
    • 44.0.1+build1-0ubuntu1
    • 44.0.2+build1-0ubuntu1
    • 45.0+build2-0ubuntu1
    • 45.0.1+build1-0ubuntu1
    • 45.0.2+build1-0ubuntu1
    • 46.0+build5-0ubuntu0.16.04.2
    • 46.0.1+build1-0ubuntu0.16.04.2
    • 47.0+build3-0ubuntu0.16.04.1
    • 48.0+build2-0ubuntu0.16.04.1
    • 49.0+build4-0ubuntu0.16.04.1
    • 49.0.2+build2-0ubuntu0.16.04.2
    • 50.0+build2-0ubuntu0.16.04.2
    • 50.0.2+build1-0ubuntu0.16.04.1
    • 50.1.0+build2-0ubuntu0.16.04.1
    • 51.0.1+build2-0ubuntu0.16.04.1
    • 51.0.1+build2-0ubuntu0.16.04.2
    • 52.0+build2-0ubuntu0.16.04.1
    • 52.0.1+build2-0ubuntu0.16.04.1
    • 52.0.2+build1-0ubuntu0.16.04.1
    • 53.0+build6-0ubuntu0.16.04.1
    • 53.0.2+build1-0ubuntu0.16.04.2
    • 53.0.3+build1-0ubuntu0.16.04.2
    • 54.0+build3-0ubuntu0.16.04.1
    • 55.0.1+build2-0ubuntu0.16.04.2
    • 55.0.2+build1-0ubuntu0.16.04.1
    • 56.0+build6-0ubuntu0.16.04.1
    • 56.0+build6-0ubuntu0.16.04.2
    • 57.0+build4-0ubuntu0.16.04.5
    • 57.0+build4-0ubuntu0.16.04.6
    • 57.0.1+build2-0ubuntu0.16.04.1
    • 57.0.3+build1-0ubuntu0.16.04.1
    • 57.0.4+build1-0ubuntu0.16.04.1
    • 58.0+build6-0ubuntu0.16.04.1
    • 58.0.1+build1-0ubuntu0.16.04.1
    • 58.0.2+build1-0ubuntu0.16.04.1
    • 59.0+build5-0ubuntu0.16.04.1
    • 59.0.1+build1-0ubuntu0.16.04.1
    • 59.0.2+build1-0ubuntu0.16.04.1
    • 59.0.2+build1-0ubuntu0.16.04.3
    • 60.0+build2-0ubuntu0.16.04.1
    • 60.0.1+build2-0ubuntu0.16.04.1
    • 60.0.2+build1-0ubuntu0.16.04.1
    • 61.0+build3-0ubuntu0.16.04.2
    • 61.0.1+build1-0ubuntu0.16.04.1
    • 62.0+build2-0ubuntu0.16.04.3
    • 62.0+build2-0ubuntu0.16.04.4
    • 62.0+build2-0ubuntu0.16.04.5
    • 62.0.3+build1-0ubuntu0.16.04.2
    • 63.0+build2-0ubuntu0.16.04.2
    • 63.0.3+build1-0ubuntu0.16.04.1
    • 64.0+build3-0ubuntu0.16.04.1
    • 65.0+build2-0ubuntu0.16.04.1
    • 65.0.1+build2-0ubuntu0.16.04.1
    • 66.0+build3-0ubuntu0.16.04.2
    • 66.0.1+build1-0ubuntu0.16.04.1
    • 66.0.2+build1-0ubuntu0.16.04.1
    • 66.0.3+build1-0ubuntu0.16.04.1
    • 66.0.4+build3-0ubuntu0.16.04.1
    • 66.0.5+build1-0ubuntu0.16.04.1
    • 67.0+build2-0ubuntu0.16.04.1
    • 67.0.1+build1-0ubuntu0.16.04.1
    • 67.0.2+build2-0ubuntu0.16.04.1
    • 67.0.3+build1-0ubuntu0.16.04.1
    • 67.0.4+build1-0ubuntu0.16.04.1
    • 68.0+build3-0ubuntu0.16.04.1
    • 68.0.1+build1-0ubuntu0.16.04.1
    • 68.0.2+build1-0ubuntu0.16.04.1
    • 69.0+build2-0ubuntu0.16.04.4
    • 69.0.1+build1-0ubuntu0.16.04.1
    • 69.0.2+build1-0ubuntu0.16.04.1
    • 70.0+build2-0ubuntu0.16.04.1
    • 70.0.1+build1-0ubuntu0.16.04.1
    • 71.0+build5-0ubuntu0.16.04.1
    • 72.0.1+build1-0ubuntu0.16.04.1
    • 72.0.2+build1-0ubuntu0.16.04.1
    • 73.0.1+build1-0ubuntu0.16.04.1
    • 74.0+build3-0ubuntu0.16.04.1
    • 74.0.1+build1-0ubuntu0.16.04.1
    • 75.0+build3-0ubuntu0.16.04.1
    • 76.0+build2-0ubuntu0.16.04.1
    • 76.0.1+build1-0ubuntu0.16.04.1
    • 77.0.1+build1-0ubuntu0.16.04.1
    • 78.0.1+build1-0ubuntu0.16.04.1
    • 78.0.2+build2-0ubuntu0.16.04.1
    • 79.0+build1-0ubuntu0.16.04.2
    • 80.0+build2-0ubuntu0.16.04.1
    • 80.0.1+build1-0ubuntu0.16.04.1
    • 81.0+build2-0ubuntu0.16.04.1
    • 81.0.2+build1-0ubuntu0.16.04.1
    • 82.0+build2-0ubuntu0.16.04.5
    • 82.0.2+build1-0ubuntu0.16.04.1
    • 82.0.3+build1-0ubuntu0.16.04.1
    Affected ranges
    • ECOSYSTEM: < 83.0+build2-0ubuntu0.16.04.3

    Update to 83.0+build2-0ubuntu0.16.04.3

  • firefox Ubuntu:18.04:LTS

    Versions
    • 56.0+build6-0ubuntu1
    • 57.0.1+build2-0ubuntu1
    • 59.0.1+build1-0ubuntu1
    • 59.0.2+build1-0ubuntu1
    • 60.0+build2-0ubuntu1
    • 60.0.1+build2-0ubuntu0.18.04.1
    • 60.0.2+build1-0ubuntu0.18.04.1
    • 61.0+build3-0ubuntu0.18.04.1
    • 61.0.1+build1-0ubuntu0.18.04.1
    • 62.0+build2-0ubuntu0.18.04.3
    • 62.0+build2-0ubuntu0.18.04.4
    • 62.0+build2-0ubuntu0.18.04.5
    • 62.0.3+build1-0ubuntu0.18.04.1
    • 63.0+build2-0ubuntu0.18.04.2
    • 63.0.3+build1-0ubuntu0.18.04.1
    • 64.0+build3-0ubuntu0.18.04.1
    • 65.0+build2-0ubuntu0.18.04.1
    • 65.0.1+build2-0ubuntu0.18.04.1
    • 66.0+build3-0ubuntu0.18.04.1
    • 66.0.1+build1-0ubuntu0.18.04.1
    • 66.0.2+build1-0ubuntu0.18.04.1
    • 66.0.3+build1-0ubuntu0.18.04.1
    • 66.0.4+build3-0ubuntu0.18.04.1
    • 66.0.5+build1-0ubuntu0.18.04.1
    • 67.0+build2-0ubuntu0.18.04.1
    • 67.0.1+build1-0ubuntu0.18.04.1
    • 67.0.2+build2-0ubuntu0.18.04.1
    • 67.0.3+build1-0ubuntu0.18.04.1
    • 67.0.4+build1-0ubuntu0.18.04.1
    • 68.0+build3-0ubuntu0.18.04.1
    • 68.0.1+build1-0ubuntu0.18.04.1
    • 68.0.2+build1-0ubuntu0.18.04.1
    • 69.0+build2-0ubuntu0.18.04.1
    • 69.0.1+build1-0ubuntu0.18.04.1
    • 69.0.2+build1-0ubuntu0.18.04.1
    • 70.0+build2-0ubuntu0.18.04.1
    • 70.0.1+build1-0ubuntu0.18.04.1
    • 71.0+build5-0ubuntu0.18.04.1
    • 72.0.1+build1-0ubuntu0.18.04.1
    • 72.0.2+build1-0ubuntu0.18.04.1
    • 73.0+build3-0ubuntu0.18.04.1
    • 73.0.1+build1-0ubuntu0.18.04.1
    • 74.0+build3-0ubuntu0.18.04.1
    • 74.0.1+build1-0ubuntu0.18.04.1
    • 75.0+build3-0ubuntu0.18.04.1
    • 76.0+build2-0ubuntu0.18.04.1
    • 76.0.1+build1-0ubuntu0.18.04.1
    • 77.0.1+build1-0ubuntu0.18.04.1
    • 78.0.1+build1-0ubuntu0.18.04.1
    • 78.0.2+build2-0ubuntu0.18.04.1
    • 79.0+build1-0ubuntu0.18.04.1
    • 80.0+build2-0ubuntu0.18.04.1
    • 80.0.1+build1-0ubuntu0.18.04.1
    • 81.0+build2-0ubuntu0.18.04.1
    • 81.0.2+build1-0ubuntu0.18.04.1
    • 82.0+build2-0ubuntu0.18.04.1
    • 82.0.2+build1-0ubuntu0.18.04.1
    • 82.0.3+build1-0ubuntu0.18.04.1
    Affected ranges
    • ECOSYSTEM: < 83.0+build2-0ubuntu0.18.04.2

    Update to 83.0+build2-0ubuntu0.18.04.2

  • thunderbird Ubuntu:18.04:LTS

    Versions
    • 1:52.4.0+build1-0ubuntu2
    • 1:52.6.0+build1-0ubuntu1
    • 1:52.7.0+build1-0ubuntu1
    • 1:52.8.0+build1-0ubuntu0.18.04.1
    • 1:52.9.1+build3-0ubuntu0.18.04.1
    • 1:60.2.1+build1-0ubuntu0.18.04.2
    • 1:60.4.0+build2-0ubuntu0.18.04.1
    • 1:60.5.1+build2-0ubuntu0.18.04.1
    • 1:60.6.1+build2-0ubuntu0.18.04.1
    • 1:60.7.0+build1-0ubuntu0.18.04.1
    • 1:60.7.1+build1-0ubuntu0.18.04.1
    • 1:60.7.2+build2-0ubuntu0.18.04.1
    • 1:60.8.0+build1-0ubuntu0.18.04.1
    • 1:60.9.0+build1-0ubuntu0.18.04.1
    • 1:68.2.1+build1-0ubuntu0.18.04.1
    • 1:68.2.2+build1-0ubuntu0.18.04.1
    • 1:68.4.1+build1-0ubuntu0.18.04.1
    • 1:68.7.0+build1-0ubuntu0.18.04.1
    • 1:68.8.0+build2-0ubuntu0.18.04.2
    • 1:68.10.0+build1-0ubuntu0.18.04.1
    Affected ranges
    • ECOSYSTEM: < 1:78.8.1+build1-0ubuntu0.18.04.1

    Update to 1:78.8.1+build1-0ubuntu0.18.04.1

  • mozjs52 Ubuntu:18.04:LTS

    Versions
    • 52.3.1-0ubuntu3
    • 52.3.1-7fakesync1
    • 52.8.1-0ubuntu0.18.04.1
    • 52.9.1-0ubuntu0.18.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mozjs38 Ubuntu:18.04:LTS

    Versions
    • 38.8.0~repack1-0ubuntu1
    • 38.8.0~repack1-0ubuntu3
    • 38.8.0~repack1-0ubuntu4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • firefox Ubuntu:20.04:LTS

    Versions
    • 69.0.3+build1-0ubuntu1
    • 70.0+build2-0ubuntu1
    • 70.0+build2-0ubuntu2
    • 70.0.1+build1-0ubuntu2
    • 71.0+build2-0ubuntu2
    • 71.0+build5-0ubuntu1
    • 72.0.1+build1-0ubuntu1
    • 72.0.2+build1-0ubuntu1
    • 73.0+build1-0ubuntu1
    • 73.0+build2-0ubuntu1
    • 73.0+build3-0ubuntu1
    • 73.0.1+build1-0ubuntu1
    • 74.0+build1-0ubuntu1
    • 74.0+build2-0ubuntu1
    • 74.0+build2-0ubuntu2
    • 74.0+build3-0ubuntu1
    • 75.0+build3-0ubuntu1
    • 76.0+build2-0ubuntu0.20.04.1
    • 76.0.1+build1-0ubuntu0.20.04.1
    • 77.0.1+build1-0ubuntu0.20.04.1
    • 78.0.1+build1-0ubuntu0.20.04.1
    • 78.0.2+build2-0ubuntu0.20.04.1
    • 79.0+build1-0ubuntu0.20.04.1
    • 80.0+build2-0ubuntu0.20.04.1
    • 80.0.1+build1-0ubuntu0.20.04.1
    • 81.0+build2-0ubuntu0.20.04.1
    • 81.0.2+build1-0ubuntu0.20.04.1
    • 82.0+build2-0ubuntu0.20.04.1
    • 82.0.2+build1-0ubuntu0.20.04.1
    • 82.0.3+build1-0ubuntu0.20.04.1
    Affected ranges
    • ECOSYSTEM: < 83.0+build2-0ubuntu0.20.04.1

    Update to 83.0+build2-0ubuntu0.20.04.1

  • thunderbird Ubuntu:20.04:LTS

    Versions
    • 1:68.1.2+build1-0ubuntu1
    • 1:68.1.2+build1-0ubuntu2
    • 1:68.2.1+build1-0ubuntu1
    • 1:68.2.2+build1-0ubuntu1
    • 1:68.3.0+build2-0ubuntu1
    • 1:68.3.1+build1-0ubuntu2
    • 1:68.4.1+build1-0ubuntu1
    • 1:68.4.2+build2-0ubuntu1
    • 1:68.5.0+build1-0ubuntu1
    • 1:68.6.0+build2-0ubuntu1
    • 1:68.7.0+build1-0ubuntu1
    • 1:68.7.0+build1-0ubuntu2
    • 1:68.8.0+build2-0ubuntu0.20.04.2
    • 1:68.10.0+build1-0ubuntu0.20.04.1
    Affected ranges
    • ECOSYSTEM: < 1:78.7.1+build1-0ubuntu0.20.04.1

    Update to 1:78.7.1+build1-0ubuntu0.20.04.1

  • mozjs68 Ubuntu:20.04:LTS

    Versions
    • 68.5.0-1~fakesync
    • 68.5.0-2~fakesync
    • 68.6.0-1
    • 68.6.0-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • mozjs52 Ubuntu:20.04:LTS

    Versions
    • 52.9.1-1build1
    • 52.9.1-1ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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