Stored Cross-Site Scripting Vulnerability in My Calendar Plugin for WordPress
CVE-2026-77186

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
My Calendar – Accessible Event Manager
Vendor
CVE Published:
9 September 2026

What is CVE-2026-77186?

The My Calendar plugin for WordPress is impacted by a Stored Cross-Site Scripting flaw that occurs due to inadequate input sanitization and output escaping in the 'fallback' Shortcode Attribute. This vulnerability allows authenticated users with contributor-level access and higher to successfully execute arbitrary web scripts on pages viewed by other users. The issue arises because hex-encoded shortcode attribute payloads escape crucial characters, which makes them undetectable during the save process, thereby leading to potential exploitations when these payloads are rendered in real-time.

Affected Version(s)

My Calendar – Accessible Event Manager 0 <= 3.8.3

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/my-calendar/tr...
https://plugins.trac.wordpress.org/browser/my-calendar/tr...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Wordfence PRISM
.