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CVE-2024-13901: Counter Box: Add Engaging Countdowns, Timers & Counters to Your WordPress Site <= 2.0.6 - Authenticated (Administrator+) DOM-Based Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-01 · updated 2026-06-17
• Weakness: CWE-79

Description

The Counter Box: Add Engaging Countdowns, Timers & Counters to Your WordPress Site plugin for WordPress is vulnerable to DOM-Based Stored Cross-Site Scripting via the ‘content’ parameter in all versions up to, and including, 2.0.6 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected products

• wpcalc Counter Box – Add Countdowns, Timers & Dynamic Counters to WordPress: before 2.0.7 — fixed in 2.0.7

How to fix

Upgrade to a fixed version: wpcalc Counter Box – Add Countdowns, Timers & Dynamic Counters to WordPress 2.0.7. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/counter-box/trunk/admin/assets/js/5.builder.js#L10
• https://plugins.trac.wordpress.org/changeset/3247696/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/251b17a7-781f-4f17-af90-9a6fbae69243?source=cve

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