CVE-2026-63670
Medium
Description
ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6.
SeverityMedium
CVSS6.1
Exploit probability—
ProductSanitize-html
PublishedAug 17, 2026
First seenAug 17, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- sanitize-html2.17.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| sanitize-htmlnpm | v < 2.17.6 | 2.17.6 |
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