Description

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From sanitize-html 2.17.7 until 2.18.0, an application configuration that permits namespace-prefixed SVG animation elements and the relevant URL-targeting attributes can bypass the SMIL URL protection because prefixed tag names do not match the unprefixed animation-element check. The bypass can rewrite a link destination to an unsafe URI after the sanitized SVG is rendered, with script execution occurring when a user activates the affected link; the default sanitizer configuration is not unconditionally affected. This issue is fixed in sanitize-html 2.18.0.

Quick Facts

References

• https://github.com/apostrophecms/apostrophe/commit/9500b8b0e…
• https://github.com/apostrophecms/apostrophe/commit/f84fd41cb…
• https://github.com/apostrophecms/apostrophe/releases/tag/san…
• https://github.com/apostrophecms/apostrophe/security/advisor…
• https://github.com/apostrophecms/apostrophe/security/advisor…

External Resources