The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 3.7.14 via the 'vcal' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to enumerate occurrence IDs and access the full iCalendar export of non-public, draft, trashed, and personal calendar events, disclosing sensitive event metadata including titles, descriptions, dates, locations, organizer and host details, permalinks, and related calendar metadata.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-11896
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/includes/date-utilities.php#L417
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/includes/ical.php#L26
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-api.php#L212
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-api.php#L246
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar-events.php#L748
• https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.7.14/my-calendar.php#L209
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/includes/date-utilities.php#L417
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/includes/ical.php#L26
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-api.php#L212
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-api.php#L246
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar-events.php#L748
• https://plugins.trac.wordpress.org/browser/my-calendar/trunk/my-calendar.php#L209
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3572191%40my-calendar&new=3572191%40my-calendar&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/a72639df-fa05-414c-b30c-eb285f59d945?source=cve