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

CVSS 9.3 · Critical EPSS 0.32% · P24

Affected Version Matrix 1

VendorProductVersion RangeStatus
apostrophecmssanitize-html< 2.17.4affected
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I. Basic Information for CVE-2026-44990

Vulnerability Information
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Vulnerability Title
Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apostrophecms sanitize-html 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apostrophecms sanitize-html是Apostrophecms公司开源的一个HTML清理库。 Apostrophecms sanitize-html 2.17.4之前版本存在跨站脚本漏洞，该漏洞源于在默认配置的 disallowedTagsMode: 'discard' 路径下，攻击者可以利用禁止的 `xmp` 元素内的内容转换为HTML或JavaScript，导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
apostrophecmssanitize-html < 2.17.4 -

II. Public POCs for CVE-2026-44990

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 6512 chars
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III. Intelligence Information for CVE-2026-44990

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Vendor Advisories for CVE-2026-44990 (1)

Same Patch Batch · apostrophecms · 2026-06-12 · 10 CVEs total

CVE-2026-536099.1 CRITICALApostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that l
CVE-2026-536088.7 HIGH@apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Inje
CVE-2026-450138.1 HIGHApostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper Inpu
CVE-2026-450127.6 HIGHApostrophe has authenticated SSRF in rich-text widget import via @apostrophecms/area/valid
CVE-2026-450117.3 HIGHApostrophe has stored XSS via javascript: URL in Image Widget Link
CVE-2026-428536.5 MEDIUM@apostrophecms/cli: Command Injection in apos create via Unsanitized Password Input
CVE-2026-536065.4 MEDIUMsanitize-html has an incomplete URI scheme validation that allows javascript: URIs through
CVE-2026-536073.7 LOW@apostrophecms/file pretty-URL Vulnerable to Unauthenticated SSRF via Host header
CVE-2026-45014Apostrophe Vulnerable to Stored Cross-Site Scripting via Unsanitized User Display Name in

IV. Related Vulnerabilities

Same product: sanitize-html
Same vendor: apostrophecms
Same weakness: CWE-79

V. Comments for CVE-2026-44990

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