Cross-site Scripting (XSS) Affecting firefox package, versions <0:78.5.0-1.el8_3


Severity

Recommended
high

Based on CentOS security rating.

Threat Intelligence

EPSS
0.1% (42nd percentile)

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  • Snyk IDSNYK-CENTOS8-FIREFOX-2085556
  • published26 Jul 2021
  • disclosed17 Nov 2020

Introduced: 17 Nov 2020

CVE-2020-26956  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Centos:8 firefox to version 0:78.5.0-1.el8_3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1