CVE-2026-22351

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Missing Authorization in WP FullCalendar ≤1.6 Enables Unauthorized Access

Publication date: 2026-02-20

Last updated on: 2026-04-28

Assigner: Patchstack

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-02-20

Last Modified

2026-04-28

Generated

2026-07-06

AI Q&A

2026-02-20

EPSS Evaluated

2026-07-05

NVD

CVE-2026-22351

Affected Vendors & Products

Vendor	Product	Version / Range
patchstack	wp_fullcalendar	to 1.6 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

CVE-2026-22351 is a Broken Access Control vulnerability in the WordPress WP FullCalendar Plugin versions up to and including 1.6.

The issue arises from missing authorization, authentication, or nonce token checks in certain plugin functions, which allows unauthenticated users to perform actions that should be restricted to higher privileged users.

This vulnerability is classified under the OWASP Top 10 category A1: Broken Access Control.

Impact Analysis

This vulnerability can allow unauthenticated attackers to perform privileged actions within the WP FullCalendar plugin, potentially leading to unauthorized changes or access to sensitive functionality.

Because the vulnerability has a CVSS score of 7.5, it is considered moderately severe with a significant likelihood of exploitation.

Without proper mitigation or patching, affected websites are at risk of compromise through exploitation of this broken access control.

Compliance Impact

I don't know

Detection Guidance

There is no specific information provided about detection commands or methods for this vulnerability.

Mitigation Strategies

Since no official patch is currently available for CVE-2026-22351, immediate mitigation involves applying the mitigation rule issued by Patchstack.

Apply the Patchstack mitigation rule that blocks all legitimate and illegitimate requests related to this vulnerability.
Use automated vulnerability mitigation services offered by Patchstack to maintain security until an official patch is released.

These steps effectively prevent exploitation by addressing the missing authorization and broken access control issues.

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