Medium [CVE-2026-73648] Cross-Site Scripting vulnerability due to improper SVG sanitization
This medium-severity Red Hat Linux advisory covers CVE-2026-73648 affecting Red Hat 3scale API Management Platform 2, Red Hat Satellite 6.
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Summary
rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 until 1.7.1, Rails::HTML::PermitScrubber restricted SVG reference elements in SVG_ALLOW_LOCAL_HREF only when they used xlink:href, even though browsers also accept the plain href attribute.
Applications with non-default allowed tags that included SVG use or feImage elements could therefore permit external references; a same-origin external SVG referenced by use could execute scripts in the sanitized document's context, while feImage could load external images for tracking. This issue is fixed in version 1.7.1.
This vulnerability allows a remote attacker to perform Cross-Site Scripting (XSS) by exploiting improper sanitization of SVG (Scalable Vector Graphics) reference elements. Exploitation requires that the application has overridden the sanitizer's default allowed tags to include SVG reference elements such as use or feImage.
Red Hat rates this Moderate. Weakness: CWE-79.
Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6. Red Hat lists Red Hat Satellite 6 as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
Mitigation checklist
- If the sanitizer's allowed tags have been overridden, remove SVG reference elements such as use and feImage from that list. Applications using the default allowed tags are not affected. Upgrade to rails-html-sanitizer 1.7.1 or later where a fix is available.
Official advisory · high-confidence parse· fetched 29 days ago·verify at source
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