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CVE-2026-35569— ApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS

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Apostrophe Technologies开源的一个全栈内容管理系统。 ApostropheCMS 4.28.0及之前版本存在安全漏洞，该漏洞源于SEO相关字段存在存储型跨站脚本漏洞，可能导致任意JavaScript执行。

CVSS 8.7 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
apostrophecms apostrophe < 4.29.0 affected
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I. Basic Information for CVE-2026-35569

Vulnerability Information
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Vulnerability Title
ApostropheCMS: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS
Source: CVE Program / CVE List V5
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including <title> tags, <meta> attributes, and JSON-LD structured data. An attacker can inject a payload such as "></title><script>alert(1)</script> to break out of the intended HTML context and execute arbitrary JavaScript in the browser of any authenticated user who views the affected page. This can be leveraged to perform authenticated API requests, access sensitive data such as usernames, email addresses, and roles via internal APIs, and exfiltrate it to an attacker-controlled server. This issue has been fixed in version 4.29.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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
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及之前版本存在安全漏洞，该漏洞源于SEO相关字段存在存储型跨站脚本漏洞，可能导致任意JavaScript执行。
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 < 4.29.0 -

II. Public POCs for CVE-2026-35569

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III. Intelligence Information for CVE-2026-35569

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Patches & Fixes for CVE-2026-35569 (1)

Proof of Concept for CVE-2026-35569 (1)

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

CVE-2026-40186 6.1 MEDIUM ApostropheCMS: sanitize-html allowedTags Bypass via Entity-Decoded Text in nonTextTags Ele
CVE-2026-33889 5.4 MEDIUM ApostropheCMS: Stored XSS via CSS Custom Property Injection in `@apostrophecms/color-field
CVE-2026-39857 5.3 MEDIUM Information Disclosure via `choices`/`counts` Query Parameters Bypassing publicApiProjecti
CVE-2026-33888 5.3 MEDIUM ApostropheCMS: publicApiProjection Bypass via `project` Query Builder in Piece-Type REST A
CVE-2026-33877 3.7 LOW ApostropheCMS: User Enumeration via Timing Side Channel in Password Reset Endpoint

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-35569

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