Is CVE-2015-3421 actively exploited?

No active exploitation of CVE-2015-3421 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2015-3421 be exploited remotely?

Yes. CVE-2015-3421 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2015-3421?

CVE-2015-3421 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2015-3421

MEDIUM

CVE-2015-3421

CWE-79Published: July 21, 2017· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

The eshop_checkout function in checkout.php in the Wordpress Eshop plugin 6.3.11 and earlier does not validate variables in the "eshopcart" HTTP cookie, which allows remote attackers to perform cross-site scripting (XSS) attacks, or a path disclosure attack via crafted variables named after target PHP variables.

NVD Source

Technical Analysis

CVE-2015-3421 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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.