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Advisories

My Calendar 3.8.8 before 3.8.11 Unauthenticated Shortcode Injection via mcs Parameter

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Severity
medium
Date
Affecting

  • My Calendar - Accessible Event Manager >= 3.8.8, < 3.8.11

CWE
  • CWE-94 Improper Control of Generation of Code ('Code Injection')
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Andres Poulin Mateos (Drakon Tech Solutions SLU), joedolson
Description
My Calendar WordPress plugin 3.8.8 before 3.8.11 contains a shortcode injection vulnerability that allows unauthenticated attackers to execute registered shortcodes via the mcs search parameter. The mcs value reaches mc_search_results() in src/my-calendar-search.php without bracket encoding before do_shortcode runs, so a GET request triggers shortcodes on any page or post, enabling content injection and spoofing.

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