🛡️ CVE-2026-35569
🟠 CVSS 8.7 — High ✅ No Known Exploit CWE-116 NVD
8.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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 tags, attributes, and JSON-LD structured data. An attacker can inject a payload such as ">alert(1) 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.

Details

Severity HIGH
CVSS Score 8.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE CWE-116
Public Exploit ✅ No
Source NVD
Published 2026-04-16
Updated 2026-06-02
Modified 2026-05-05

Affected Packages

Software From version Fixed in
apostrophe — —
apostrophecms — 4.29.0

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