Critical severity · published Jun 12, 2026
CVE-2026-44990
Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`
9.3
CVSS
0.7%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SA
sanitize-html · apostrophecms
< 2.17.4 · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.11 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.13 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.14 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.15 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.16 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Container Native Virtualization 4.19 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Container Native Virtualization 4.20 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift AI (RHOAI) · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift Container Platform 4.20 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44990
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44990
github.com
https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-rpr9-rxv7-x643
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36882
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:36883
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:40262
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:41031
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:41055
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