CVE-2026-53606: Apostrophecms Sanitize-Html

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Versions of sanitize-html prior to 2.17.5 use `allowedSchemesAppliedToAttributes` (default: `['href', 'src', 'cite']`) to gate the `naughtyHref()` function that blocks dangerous URI schemes like `javascript:` and `vbscript:`. The HTML specification defines 10+ attributes that accept URIs (`action`, `formaction`, `data`, `poster`, `background`, `ping`, `xlink:href`, `dynsrc`, `lowsrc`), but none of these are included in the default gate list. When a developer allows any of these attributes in their configuration, `javascript:` URIs pass through completely unmodified, enabling XSS. Version 2.17.5 patches the issue.

Affected products

• Apostrophecms Sanitize-Html: before 2.17.5 (fixed in 2.17.5)

Published 2026-06-12. Last modified 2026-06-17.