CVE-2025-13898

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.

CVSS 3.1

6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2025-12-06

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

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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