Review reviewCritical

CVE-2026-44990

apostrophecms sanitize-html, multicluster engine for Kubernetes 2.1, multicluster engine for Kubernetes 2.6

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.

CVSS: 9.3
EPSS: 0.51%
CISA KEV: Not listed
Published: 2026.06.13

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.51%

Technical severityCVSS 9.3

Vulnerability overview

Affected product and versions

Product: apostrophecms sanitize-html, multicluster engine for Kubernetes 2.1, multicluster engine for Kubernetes 2.6
Affected versions: >= < 2.17.4
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that apostrophecms sanitize-html, multicluster engine for Kubernetes 2.1, multicluster engine for Kubernetes 2.6 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CWE: CWE-79