CVE-2026-104798 My Calendar – Accessible Event Manager - Privilege Escalation

My Calendar – Accessible Event Manager WordPress plugin <= 3.8.7 contains a privilege escalation caused by unsanitized 'mcs' GET parameter allowing unauthenticated attackers to invoke arbitrary PHP functions, letting attackers gain full admin access, exploit requires no authentication.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
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