CVE-2020-4054

Description

In Sanitize (RubyGem sanitize) greater than or equal to 3.0.0 and less than 5.2.1, there is a cross-site scripting vulnerability. When HTML is sanitized using Sanitize's "relaxed" config, or a custom config that allows certain elements, some content in a math or svg element may not be sanitized correctly even if math and svg are not in the allowlist. You are likely to be vulnerable to this issue if you use Sanitize's relaxed config or a custom config that allows one or more of the following HTML elements: iframe, math, noembed, noframes, noscript, plaintext, script, style, svg, xmp. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML through Sanitize, potentially resulting in XSS (cross-site scripting) or other undesired behavior when that HTML is rendered in a browser. This has been fixed in 5.2.1.

How to fix CVE-2020-4054

To remediate CVE-2020-4054, upgrade the affected package to a fixed version below.

• —upgrade to 5.2.1 or later

Is CVE-2020-4054 being exploited?

Low — EPSS is 1.9%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• >= 3.0.0, < 5.2.1

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2020-4054
• PATCHgithub.com/rgrove/sanitize
• WEBgithub.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aa9
• WEBgithub.com/rgrove/sanitize/releases/tag/v5.2.1