Description
The WebberZone Top 10 — Popular Posts plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'other_attributes (parsed to inject instance_id) + undeclared is_widget' parameter in all versions up to, and including, 4.5.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit requires setting the undeclared is_widget flag to '1' via block JSON, which activates the vulnerable code path that concatenates the attacker-controlled instance_id value into an unescaped HTML class attribute.
References8
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.2/includes/f…
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.2/includes/f…
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.2/includes/f…
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.2/includes/f…
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.2/includes/u…
- plugins.trac.wordpress.org/browser/top-10/tags/4.5.3/includes/f…
- plugins.trac.wordpress.org/changeset/3747022
- www.wordfence.com/threat-intel/vulnerabilities/id/4db4a201-a7fa…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 10 · as of 10 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.