CVE-2026-44990: Apostrophecms Sanitize-Html

Critical severity, CVSS 9.3. EPSS: 0.7% chance of exploitation in the next 30 days.

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 products

Apostrophecms Sanitize-Html: before 2.17.4 (fixed in 2.17.4)
Red Hat Multicluster Engine For Kubernetes 2.1: before 1784312384 (fixed in 1784312384)
Red Hat Multicluster Engine For Kubernetes 2.11: before 1786911977 (fixed in 1786911977)
Red Hat Multicluster Engine For Kubernetes 2.17: before 1786668856 (fixed in 1786668856)
Red Hat Multicluster Engine For Kubernetes 2.6: before 1783351002 (fixed in 1783351002)
Red Hat Multicluster Engine For Kubernetes 2.8: before 1785078604 (fixed in 1785078604)
Red Hat Multicluster Engine For Kubernetes 2.9: before 1783348181 (fixed in 1783348181)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.11: before 1783350952 (fixed in 1783350952)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.13: before 1785078581 (fixed in 1785078581)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.14: before 1783451729 (fixed in 1783451729)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.15: before 1784578812 (fixed in 1784578812)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.16: before 1786908361 (fixed in 1786908361)
Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.17: before 1787335105 (fixed in 1787335105)
Red Hat Red Hat Container Native Virtualization 4.19: before 1784844382 (fixed in 1784844382)
Red Hat Red Hat Container Native Virtualization 4.20: before 1784629964 (fixed in 1784629964)
Red Hat Red Hat Hardened Images
Red Hat Red Hat Openshift Ai Rhoai
Red Hat Red Hat Openshift Container Platform 4
Red Hat Red Hat Openshift Container Platform 4.20: before 1788350963 (fixed in 1788350963)
Red Hat Red Hat Openshift Container Platform 4.21: before 1788359934 (fixed in 1788359934)
Red Hat Red Hat Openshift Container Platform 4.22: before 1787746382 (fixed in 1787746382)
Red Hat Red Hat Openshift Dev Spaces 3.29: before 1784737150 (fixed in 1784737150)
Red Hat Red Hat Quay 3.10: before 1783750447 (fixed in 1783750447)
Red Hat Red Hat Quay 3.12: before 1783751865 (fixed in 1783751865)
Red Hat Red Hat Quay 3.15: before 1784351966 (fixed in 1784351966)
and 5 more

Published 2026-06-12. Last modified 2026-09-10.