Is CVE-2021-47737 actively exploited?

No active exploitation of CVE-2021-47737 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-47737 be exploited remotely?

Yes. CVE-2021-47737 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-47737?

CVE-2021-47737 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2021-47737

CWE-79Published: December 23, 2025· Updated: Jun 17, 2026

5.4

CVSS v3.1

Official Description

CSZ CMS 1.2.7 contains an HTML injection vulnerability that allows authenticated users to insert malicious hyperlinks in message titles. Attackers can craft POST requests to the member messaging system with HTML-based links to potentially conduct phishing or social engineering attacks.

NVD Source

Technical Analysis

CVE-2021-47737 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.

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.