Paypal Shortcodes <= 0.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'amount' and 'name' Shortcode Attributes

Summary

The Paypal Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'amount' and 'name' shortcode attributes in all versions up to, and including, 0.3. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. The swer_paypal_shortcode() function extracts shortcode attributes using extract() and shortcode_atts() at line 89, then directly concatenates the $name and $amount values into HTML input element value attributes at lines 105-106 without applying esc_attr() or any other escaping function. 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.

Timeline

1. Mar 21, 2026, 3:26 AM UTCCVE published
2. Mar 23, 2026, 4:30 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Apr 8, 2026, 5:14 PM UTCRecord last updated

Affected versions

• swergroup Paypal Shortcodes

  through 0.3

References 7