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CVE-2026-63670— ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close

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 2.17.6之前版本存在跨站脚本漏洞，该漏洞源于sanitizeHtml()函数在处理textarea或xmp元素时未正确转义内容，导致浏览器将后续img的onerror标记解析为活动HTML，容易受到跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
apostrophecms apostrophe < 2.17.6 affected
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I. Basic Information for CVE-2026-63670

Vulnerability Information
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Vulnerability Title
ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close
Source: CVE Program / CVE List V5
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 2.17.6之前版本存在跨站脚本漏洞，该漏洞源于sanitizeHtml()函数在处理textarea或xmp元素时未正确转义内容，导致浏览器将后续img的onerror标记解析为活动HTML，容易受到跨站脚本攻击。
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 < 2.17.6 -

II. Public POCs for CVE-2026-63670

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III. Intelligence Information for CVE-2026-63670

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Patches & Fixes for CVE-2026-63670 (2)

Vendor Advisories for CVE-2026-63670 (1)

Same Patch Batch · apostrophecms · 2026-08-17 · 4 CVEs total

CVE-2026-71553 7.1 HIGH ApostropheCMS: 2nd-order prototype pollution via PATCH leading to single-request persisten
CVE-2026-63669 6.5 MEDIUM ApostropheCMS: Missing destination-parent authorization in page `move()` allows a low-priv
CVE-2026-63667 6.5 MEDIUM ApostropheCMS: Arbitrary file read via import-export attachment-name path traversal

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-63670

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