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CVE-2025-13857: Yet Another WebClap for WordPress <= 0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

• 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 Yet Another WebClap for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'text' parameter of the webclap_button shortcode in all versions up to, and including, 0.2 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

• ksakai Yet Another WebClap for WordPress: through 0.2

References

• https://plugins.trac.wordpress.org/browser/yet-another-webclap-for-wordpress/tags/0.2/yawebclap.php#L28
• https://plugins.trac.wordpress.org/browser/yet-another-webclap-for-wordpress/trunk/yawebclap.php#L28
• https://www.wordfence.com/threat-intel/vulnerabilities/id/ca50e5e7-be46-40f1-9782-a72ca8ab7e9a?source=cve

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