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CVE-2026-40186— ApostropheCMS: sanitize-html allowedTags Bypass via Entity-Decoded Text in nonTextTags Elements

CVSS 6.1 · Medium EPSS 0.01% · P1
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I. Basic Information for CVE-2026-40186

Vulnerability Information
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Vulnerability Title
ApostropheCMS: sanitize-html allowedTags Bypass via Entity-Decoded Text in nonTextTags Elements
Source: NVD (National Vulnerability Database)
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system. A regression introduced in commit 49d0bb7, included in versions 2.17.1 of the ApostropheCMS-maintained sanitize-html package bypasses allowedTags enforcement for text inside nonTextTagsArray elements (textarea and option). ApostropheCMS version 4.28.0 is affected through its dependency on the vulnerable sanitize-html version. The code at packages/sanitize-html/index.js:569-573 incorrectly assumes that htmlparser2 does not decode entities inside these elements and skips escaping, but htmlparser2 10.x does decode entities before passing text to the ontext callback. As a result, entity-encoded HTML is decoded by the parser and then written directly to the output as literal HTML characters, completely bypassing the allowedTags filter. An attacker can inject arbitrary tags including XSS payloads through any allowed option or textarea element using entity encoding. This affects non-default configurations where option or textarea are included in allowedTags, which is common in form builders and CMS platforms. This issue has been fixed in version 2.17.2 of sanitize-html and 4.29.0 of ApostropheCMS.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ApostropheCMS是Apostrophe Technologies开源的一个全栈内容管理系统。 ApostropheCMS 4.28.0版本存在安全漏洞，该漏洞源于sanitize-html包存在绕过allowedTags强制执行的问题，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

VendorProductAffected VersionsCPESubscribe
apostrophecmsapostrophe >= 4.28.0, < 4.29.0 -
apostrophecmssanitize-html >= 2.17.1, < 2.17.2 -

II. Public POCs for CVE-2026-40186

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III. Intelligence Information for CVE-2026-40186

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Same Patch Batch · apostrophecms · 2026-04-15 · 6 CVEs total

CVE-2026-355698.7 HIGHApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in Apostr
CVE-2026-338895.4 MEDIUMApostropheCMS: Stored XSS via CSS Custom Property Injection in `@apostrophecms/color-field
CVE-2026-398575.3 MEDIUMInformation Disclosure via `choices`/`counts` Query Parameters Bypassing publicApiProjecti
CVE-2026-338885.3 MEDIUMApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST A
CVE-2026-338773.7 LOWApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint

IV. Related Vulnerabilities

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

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