CVE-2026-22351 HIGH

CVE-2026-22351: WordPress WP FullCalendar plugin <= 1.6 - Broken Access Control vulnerability

Vendor Marcus (Aka @Msykes)
Product WP FullCalendar
Weakness CWE-862 · Missing authorization
Published February 20, 2026
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

Missing Authorization vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP FullCalendar: from n/a through <= 1.6.

Explanation of Vulnerability in Simple Terms

02Summary

WP FullCalendar versions 1.6 and earlier lack proper authorization checks, allowing unauthenticated attackers to read sensitive calendar data over the network. The vulnerability requires no user interaction and affects the confidentiality of stored information. Site administrators should update to a version newer than 1.6 as soon as a patch becomes available.

What an attacker can do

03Attacker Capabilities

Read sensitive calendar data without logging in.

Potential impact on your site

04Site Impact

Unauthorized users can view private calendar events and information stored in the plugin.

Conditions required to exploit

05Prerequisites

Network access to the site; no authentication or user interaction required.

Key dates

06Disclosure timeline

February 20, 2026 CVE published
April 28, 2026 Record updated