Is CVE-2026-15984 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15984?

CVE-2026-15984 has a CVSS v3 severity of HIGH (7.2).

Back

CVE-2026-15984

Description

The QuickCal plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Custom Field Parameters in all versions up to, and including, 1.0.20 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nonce guarding the unauthenticated booked_add_appt AJAX action is publicly embedded on any page rendering the booking calendar shortcode, making it trivially obtainable by unauthenticated attackers without any prior account or privilege.