CVE-2025-13898: SOZAN45 Ultra Skype Button

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Ultra Skype Button plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'btn_id' parameter of the [ultra_skype] shortcode in all versions up to, and including, 1.0 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.

Affected products

• SOZAN45 Ultra Skype Button: up to and including 1.0

Published 2025-12-06. Last modified 2026-06-17.