What is CVE-2025-13898?

CVE-2025-13898 is a medium-severity vulnerability in Sozan45 Ultra Skype Button, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-12-06.

How severe is CVE-2025-13898?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Sozan45 Ultra Skype Button

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Sozan45 Ultra Skype Button — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2025-13898?: CVE-2025-13898 is a medium-severity vulnerability in Sozan45 Ultra Skype Button, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2025-12-06.
How severe is CVE-2025-13898?: Medium severity. CVSS v3 base score is 6.4 out of 10.