CVE-2026-44990

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

Published: Jun 12, 2026Updated: Sep 10, 2026 Sources: CVE List NVDCWE-79

9.3CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

apostrophecms

commercialaka apostrophe

sanitize-htmlOn-prem

Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-rpr9-rxv7-x643

github.com

https://access.redhat.com/errata/RHSA-2026:36882

access.redhat.com

https://access.redhat.com/errata/RHSA-2026:36883

access.redhat.com

and 28 more references View all →

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