CVE-2020-26956

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

References

Affected packages

Debian:11 / firefox-esr

Package

Name: firefox-esr
Purl: pkg:deb/debian/firefox-esr?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

78.5.0esr-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / firefox-esr

Package

Name: firefox-esr
Purl: pkg:deb/debian/firefox-esr?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

78.5.0esr-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / firefox-esr

Package

Name: firefox-esr
Purl: pkg:deb/debian/firefox-esr?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

78.5.0esr-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:11 / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/debian/thunderbird?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:78.5.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/debian/thunderbird?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:78.5.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / thunderbird

Package

Name: thunderbird
Purl: pkg:deb/debian/thunderbird?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:78.5.0-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}