The Spiffy Calendar plugin for WordPress contains a missing authorization flaw that allows authenticated users to bypass intended access controls, posing a risk to site integrity.

This vulnerability is a CWE-862 Missing Authorization flaw, which occurs when the software does not perform a required authorization check. Per the CVSS vector (PR:L), this requires the attacker to be an authenticated user to trigger the flaw.

The vulnerability allows authenticated users to perform unauthorized actions within the plugin, which could lead to the modification of calendar data or settings. With a CVSS score of 8.1, the issue is considered high severity because it undermines the administrative security boundaries of the application. Unauthorized access can result in data integrity issues and potential disruption of organizational scheduling workflows.

Immediate Action: Review the official Spiffy Plugins security advisories and update to the latest available version once a patch is released to resolve the authorization check failure.

Proactive Monitoring: Monitor WordPress access logs for unusual administrative activity or unauthorized modifications to calendar entries originating from standard user accounts.

Compensating Controls: Deploy a Web Application Firewall (WAF) with rules configured to block suspicious requests targeting the Spiffy Calendar plugin endpoints until an official update is applied.

Public Exploit Available: No — there is no confirmed public exploit available.

Given the high CVSS score, organizations using Spiffy Calendar should prioritize monitoring their user activity and restrict plugin access to trusted roles until a permanent patch is verified. Administrators must ensure that the plugin is updated immediately upon the release of a fix to eliminate this authorization bypass vulnerability.