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.
ApostropheCMS 是一个开源的 Node.js 内容管理系统，sanitize-html 则提供了一个具有清晰 API 的简单 HTML 净化库。在 1.9.0 版本到 2.17.7 版本之前， 将 元素的 属性视为一个平铺的 URL 进行校验，未能识别出：当 指定为 或 时，其兄弟属性 、 或 在 SVG SMIL（同步化和多媒体集成语言）中具有特殊的 URL 语义。 在允许使用 、 、 、 或 元素的配置下， 列表可以以一个安全的片段开头，并在其后包含一个可执行的目标地址；该目标地址能够绕过 的检查。
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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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| apostrophecms | apostrophe | >= 1.9.0, < 2.17.7 | - |
|
II. Public POCs for CVE-2026-84371
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-84371 (5)
-
https://github.com/apostrophecms/apostrophe/pull/5552 x_refsource_MISC
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V. Comments for CVE-2026-84371
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