WP FullCalendar <= 1.4.1 - Missing Authorization to Information Disclosure
Strategic Overview
- Status
- Patched in 1.5
- Affected Plugin
- WP FullCalendar
- Affected Version
<= 1.4.1- CVSS
- 6.5Medium
- Weakness type
- CWE-862 · Missing Authorization
- CVE
CVE-2022-3891
At a glance
CVE-2022-3891 is a medium-severity Missing Authorization vulnerability in the WP FullCalendar WordPress plugin, affecting versions <= 1.4.1. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.5; sites on affected versions should update now. Disclosed January 2023, reported by István Márton.
Vulnerability Overview
The WP FullCalendar plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on several AJAX actions in versions up to, and including, 1.4.1. This makes it possible for unauthenticated attackers to view arbitrary posts and pages regardless of password protection and whether they are private.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-862: Missing Authorization
Reaching this weakness in WP FullCalendar <= 1.4.1 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.
Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For WP FullCalendar the fix is 1.5: builds <= 1.4.1 are affected, anything from 1.5 onward is not.
Remediation
Update to version 1.5, or a newer patched version
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: WP FullCalendar 1.5 closes this, and updating the plugin is the step that ends it.
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in WP FullCalendar
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