---
id: CVE-2026-77187
title: >-
  My Calendar <= 3.8.3 - Authenticated (Contributor+) Stored Cross-Site
  Scripting via 'before' and 'after' Shortcode Attributes
summary: >-
  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…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: joedolson
product: My Calendar – Accessible Event Manager
affected:
  - my_calendar_accessible_event_manager <= 3.8.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T20:10:18.400694Z'
published: '2026-09-09'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:19:14.864Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77187'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/8c8beca2-d02b-4379-99e9-8090ef84ca6d?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar-events.php#L1102
  - url: >-
      https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar-shortcodes.php#L358
  - url: >-
      https://plugins.trac.wordpress.org/browser/my-calendar/tags/3.8.0/my-calendar.php#L563
  - url: >-
      https://github.com/joedolson/my-calendar/commit/89bbf7314fac84cdb89e520e8b7b6d69eee8dd3c
tags:
  - cve.org
epss: 0.00193
epssPercentile: 0.09288
ingestedAt: '2026-09-14T11:11:19.882Z'
---

## Overview

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

- `my_calendar_accessible_event_manager <= 3.8.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.