CVE-2026-104798: My Calendar – Accessible Event Manager 0 through 3.4.24, 3.5 through 3.5.21, 3.6 through 3.6.17, 3.7 through 3.7.17…

Affected technology

My Calendar – Accessible Event Manager · 0 through 3.4.24, 3.5 through 3.5.21, 3.6 through 3.6.17, 3.7 through 3.7.17, 3.8 through 3.8.7
joedolson

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An unauthenticated attacker can inject a nested `[my_calendar above=...]` shortcode; `mc_generate_calendar_nav()` then splits the `above` attribute on commas and dispatches each element via `call_user_func()` with no authentication, authorization, or callable allowlist check. Vendor/CNA’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high.