CVE-2026-119714
My Calendar 3.8.8 before 3.8.11 Unauthenticated Shortcode Injection via mcs Parameter
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- Reserved
- Oct 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-94 Improper Control of Generation of Code ('Code Injection')
Affected Products
| Product | Versions |
|---|---|
My Calendar - Accessible Event Managerjoedolson |
|
References
- Patch Commitpatch
- https://github.com/joedolson/my-calendarproduct
- My Calendar - Accessible Event Manager v3.8.11 Release Notesrelease-notes
- https://github.com/joedolson/my-calendar/blob/v3.8.10/src/my-calendar-search.php#L170technical-description
- VulnCheck Advisory: My Calendar 3.8.8 before 3.8.11 Unauthenticated Shortcode Injection via mcs Parameterthird-party-advisory
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