Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`
CVE-2026-44990

9.3CRITICAL

Key Information:

Vendor

Apostrophecms

Status
Sanitize-html
Vendor
CVE Published:
12 June 2026

What is CVE-2026-44990?

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Under the default configuration, versions of sanitize-html prior to 2.17.4 can turn attacker-controlled content inside a disallowed xmp element into live HTML or JavaScript. This is a sanitizer bypass in the default disallowedTagsMode: 'discard' path and can lead to stored XSS in applications that render sanitized output back to users. Version 2.17.4 patches the issue.

Affected Version(s)

sanitize-html < 2.17.4

References

https://github.com/apostrophecms/apostrophe/security/advi...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.