Is CVE-2026-35569 actively exploited?

No active exploitation of CVE-2026-35569 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-35569 be exploited remotely?

Yes. CVE-2026-35569 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-35569?

CVE-2026-35569 has a CVSS score of 8.7 (HIGH).

HOME VULNERABILITIESCVE-2026-35569

HIGH

CVE-2026-35569

CWE-79Published: April 15, 2026· Updated: Apr 17, 2026

8.7

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-35569 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.7.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.