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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| joedolson | My Calendar - Accessible Event Manager | 3.8.8 – < 3.8.11 | 3.8.11 |
References
- Patch Commit patch
- https://github.com/joedolson/my-calendar product
- My Calendar - Accessible Event Manager v3.8.11 Release Notes release-notes
- https://github.com/joedolson/my-calendar/blob/v3.8.10/src/my-calendar-search.php#L170 technical-description
- VulnCheck Advisory: My Calendar 3.8.8 before 3.8.11 Unauthenticated Shortcode Injection via mcs Parameter third-party-advisory