CVE-2022-23519: Possible XSS vulnerability with certain configurations of rails-html-sanitizer

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-12-14 · updated 2026-06-17
Weakness: CWE-79

Description

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Prior to version 1.4.4, a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags in either of the following ways: allow both "math" and "style" elements, or allow both "svg" and "style" elements. Code is only impacted if allowed tags are being overridden. . This issue is fixed in version 1.4.4. All users overriding the allowed tags to include "math" or "svg" and "style" should either upgrade or use the following workaround immediately: Remove "style" from the overridden allowed tags, or remove "math" and "svg" from the overridden allowed tags.

Affected products

Debian Linux: 10.0
rails-html-sanitizer: before 1.4.4 — fixed in 1.4.4
Rubygems Rails-Html-Sanitizer: before 1.4.4; 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.1.0 (+6) — fixed in 1.4.4

How to fix

Upgrade to a fixed version: rails-html-sanitizer 1.4.4; Rubygems Rails-Html-Sanitizer 1.4.4. Check the vendor advisory for mitigations.

References

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