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CVE-2026-84371— ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass

Quick assessment

Affected
apostrophecms apostrophe
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apostrophe Technologies ApostropheCMS是Apostrophe Technologies公司开源的一个全栈内容管理系统。 Apostrophe Technologies ApostropheCMS 1.9.0版本至2.17.7之前版本存在跨站脚本漏洞，该漏洞源于sanitize-html组件对动画值属性验证不当，未正确处理SVG SMIL URL语义，可能导致跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
apostrophecms apostrophe >= 1.9.0, < 2.17.7 affected
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I. Basic Information for CVE-2026-84371

Vulnerability Information
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Vulnerability Title
ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass
Source: CVE Program / CVE List V5
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Apostrophe Technologies ApostropheCMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apostrophe Technologies ApostropheCMS是Apostrophe Technologies公司开源的一个全栈内容管理系统。 Apostrophe Technologies ApostropheCMS 1.9.0版本至2.17.7之前版本存在跨站脚本漏洞，该漏洞源于sanitize-html组件对动画值属性验证不当，未正确处理SVG SMIL URL语义，可能导致跨站脚本攻击。
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

Vendor Product Affected Versions CPE Subscribe
apostrophecms apostrophe >= 1.9.0, < 2.17.7 -

II. Public POCs for CVE-2026-84371

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III. Intelligence Information for CVE-2026-84371

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Patches & Fixes for CVE-2026-84371 (2)

Vendor Advisories for CVE-2026-84371 (1)

IV. Related Vulnerabilities

Same product: apostrophe
Same vendor: apostrophecms
Same weakness: CWE-79

V. Comments for CVE-2026-84371

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