StatCounter <= 2.1.1 - Authenticated (Author+) Stored Cross-Site Scripting via Author Nickname

6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-6275
CVSS 6.4 (Medium)
Publicly Published May 28, 2026
Last Updated May 29, 2026
Researcher ZAST.AI - ZAST.AI

Description

The StatCounter – Free Real Time Visitor Stats plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.1.1 This is due to insufficient output escaping on the post author's nickname in the statcounter_addToTags() function. The function is hooked to wp_head and fires on every single post page. It retrieves the post author's nickname via the_author_meta() and echoes it directly into a JavaScript double-quoted string context inside a <script> block without applying esc_js() or any equivalent JavaScript-context escaping. This makes it possible for authenticated attackers with Author-level access and above to inject arbitrary web scripts into pages that will execute whenever any user (including unauthenticated visitors) accesses a post authored by the attacker.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for StatCounter – Free Real Time Visitor Stats

Software Type Plugin
Software Slug official-statcounter-plugin-for-wordpress (view on wordpress.org)
Patched? Yes
Remediation Update to version 2.1.2, or a newer patched version
Affected Version
  • <= 2.1.1
Patched Version
  • 2.1.2

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