My Calendar – Accessible Event Manager <= 3.7.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-2355
CVSS Medium (6.4)
Publicly Published March 3, 2026
Last Updated March 4, 2026
Researcher Muhammad Yudha - DJ
Description

The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\x3c` to `<`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

References

1 affected software package

Software Type Plugin
Software Slug my-calendar (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 3.7.3
Patched Version
  • 3.7.4
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