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
- CWE – CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’) (4.9)
- SVG MIME Type (image/svg+xml) is misleading to developers · Issue #266 · w3c/svgwg
- https://github.com/rails/rails-html-sanitizer/issues/135
- https://hackerone.com/reports/1694173
Credit
This vulnerability was independently reported by Maciej Piechota (@haqpl) and Mrinmoy Das (@goromlagche).
References
- https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-mcvf-2q2m-x72m
- https://github.com/rails/rails-html-sanitizer/issues/135
- https://github.com/w3c/svgwg/issues/266
- https://hackerone.com/reports/1694173
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rails-html-sanitizer/CVE-2022-23518.yml
- https://nvd.nist.gov/vuln/detail/CVE-2022-23518
- https://github.com/advisories/GHSA-mcvf-2q2m-x72m