What’s Vulnerable › Vulnerabilities

CVE-2025-13898: Ultra Skype Button <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'btn_id' Shortcode Attribute

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-06 · updated 2026-10-15
• Weakness: CWE-79

Description

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: through 1.0

References

• https://plugins.trac.wordpress.org/browser/ultra-skype-button/tags/1.0/index.php#L39
• https://plugins.trac.wordpress.org/browser/ultra-skype-button/tags/1.0/index.php#L44
• https://plugins.trac.wordpress.org/browser/ultra-skype-button/trunk/index.php#L39
• https://plugins.trac.wordpress.org/browser/ultra-skype-button/trunk/index.php#L44
• https://www.wordfence.com/threat-intel/vulnerabilities/id/20b3c88f-a0df-4814-83b6-27440c5ad38e?source=cve

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