Is CVE-2026-77187 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-77187?

CVE-2026-77187 has a CVSS v3 severity of MEDIUM (6.4).

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CVE-2026-77187

Description

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes in all versions up to, and including, 3.8.3 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.