# CVE-2026-77187

## Summary

- **CVE ID:** CVE-2026-77187
- **Severity:** MEDIUM
- **CVSS Score:** 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **CWE:** CWE-79
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## 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.

## Affected Products

- joedolson — My Calendar – Accessible Event Manager (0)

## References

- [CNA](https://www.wordfence.com/threat-intel/vulnerabilities/id/8c8beca2-d02b-4379-99e9-8090ef84ca6d?source=cve)
- [CNA](https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar-events.php#L1102)
- [CNA](https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar-shortcodes.php#L358)
- [CNA](https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar.php#L563)
- [CNA](https://github.com/joedolson/my-calendar/commit/89bbf7314fac84cdb89e520e8b7b6d69eee8dd3c)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 9.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._