Improper neutralization of data URIs may allow XSS in rails-html-sanitizer

MEDIUM 6.1CVE-2022-23518 · GHSA-mcvf-2q2m-x72m · Published 14/12/2022 · updated 17/06/2026

Package	Affected versions	Patched versions
rails-html-sanitizer RubyGems	`≥ 1.0.3, < 1.4.4`	`1.4.4`
loofah loofah_project	`≥ 2.1.0, < 2.19.1`	`2.19.1`
rails html sanitizers rubyonrails	`≥ 1.0.3, < 1.4.4`	`1.4.4`

Description

Summary

rails-html-sanitizer >= 1.0.3, < 1.4.4 is vulnerable to cross-site scripting via data URIs when used in combination with Loofah >= 2.1.0.

Mitigation

Upgrade to rails-html-sanitizer >= 1.4.4.

Severity

The maintainers have evaluated this as Medium Severity 6.1.

References

Credit

This vulnerability was independently reported by Maciej Piechota (@haqpl) and Mrinmoy Das (@goromlagche).

NVD description

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Versions >= 1.0.3, < 1.4.4 are vulnerable to cross-site scripting via data URIs when used in combination with Loofah >= 2.1.0. This issue is patched in version 1.4.4.

References

rails/rails-html-sanitizer security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2022-23518 · ADVISORY
rails/rails-html-sanitizer · WEB
w3c/svgwg · WEB
hackerone.com/reports/1694173 · WEB
rails/rails-html-sanitizer · PACKAGE
rubysec/ruby-advisory-db · WEB
lists.debian.org/debian-lts-announce/2023/09/msg00012.html · WEB
lists.debian.org/debian-lts-announce/2024/09/msg00045.html · WEB

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