ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass — GHSA-G8QQ-57P8-GGW5

Summary

### Summary When SVG animation is allowed, `attributeName="href"` makes `values` a list of URL destinations. `sanitize-html` accepts a list that starts with a safe fragment even when `values` is explicitly scheme-checked, allowing a later `javascript:` destination to execute when the sanitized link is activated. ### Details `index.js:371-383` validates each attribute as one flat URL. It does not recognize that…

Timeline

Published by source

2026-09-01

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 5.4 out of 10.
• Review exposure for the affected product or family: npm: sanitize-html.

Product

npm: sanitize-html

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-G8QQ-57P8-GGW5

Source

GitHub

Vendor

GitHub

Published by source

2026-09-01

Last source activity

2026-09-01

Additional identifiers

CVE-2026-84371

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.