Advisory Weakness Curation

Improper neutralization of data URIs may allow XSS in rails-html-sanitizer ## 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 https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. ## References - CWE - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (4.9) https://cwe.mitre.org/data/definitions/79.html - SVG MIME Type (image/svg+xml) is misleading to developers · Issue #266 · w3c/svgwg https://github.com/w3c/svgwg/issues/266 - 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).

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Versions >= 1.0.3, < 1.4.4 is 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.

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

Duplicate This advisory duplicates another.