My Calendar permits stored scripts through before and after shortcode attributes
My Calendar through 3.8.3 inadequately sanitizes and escapes the before and after shortcode attributes. A Contributor or higher-privileged user can store script content in those attributes, which executes when another user views the rendered page.
- Component
- My Calendar – Accessible Event Manager
- Plugin slug
my-calendar- Affected
- <= 3.8.3
- Safe version
3.8.4- Published
- Sep 09, 2026
This CVE was published Sep 09, 2026 and is one of 14 known issues for this plugin.
Update, patch or deactivate.
Update My Calendar to 3.8.4 or later. The official changelog identifies the matching fix. The checked current release is 3.8.4.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'before' and 'after' Shortcode Attributes in all versions up to, and including, 3.8.3 due to insufficient input sanitization and output escaping. 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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N