CVE-2026-32583 in Modern Events Calendar Plugin
Summary
by MITRE • 03/16/2026
Missing Authorization vulnerability in Webnus Inc. Modern Events Calendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Modern Events Calendar: from n/a through 7.29.0.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2026-32583 represents a critical missing authorization flaw within the Webnus Inc. Modern Events Calendar plugin, which operates as a widely used event management system for wordpress platforms. This security weakness stems from incorrectly configured access control security levels that fail to properly validate user permissions before granting access to sensitive administrative functions. The vulnerability exists across all versions from the initial release through version 7.29.0, indicating a prolonged period during which the plugin remained susceptible to unauthorized access attempts. The affected system operates under the assumption that proper authorization checks are in place, but in reality, the access control mechanisms are insufficiently implemented or misconfigured, allowing malicious actors to bypass normal security protocols.
The technical implementation of this vulnerability manifests through improper validation of user roles and capabilities within the plugin's access control system. When users attempt to access administrative functions or modify event data, the system fails to adequately verify whether the requesting user possesses the necessary permissions to perform such actions. This misconfiguration creates a pathway for unauthorized individuals to exploit the system by leveraging their access to perform operations that should be restricted to administrators or authorized personnel only. The flaw operates at the application level where the plugin fails to enforce proper role-based access control mechanisms, allowing users with minimal privileges to access functionality typically reserved for privileged users. This type of vulnerability aligns with CWE-285, which specifically addresses improper authorization within software systems, and represents a fundamental breakdown in the principle of least privilege enforcement.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables attackers to potentially manipulate event data, modify calendar configurations, and access sensitive information stored within the plugin's database. An attacker could leverage this weakness to add, delete, or modify events without proper authorization, potentially disrupting event scheduling, altering event details, or even injecting malicious content into the calendar system. The consequences of such unauthorized modifications could range from minor disruptions to significant security breaches, particularly in environments where the calendar system contains sensitive organizational information or serves as a critical communication platform. The vulnerability's persistence across multiple versions suggests that organizations using the Modern Events Calendar plugin may have been exposed to potential exploitation for an extended period without detection.
Mitigation strategies for this vulnerability require immediate attention from system administrators and security teams responsible for maintaining wordpress installations. The primary recommendation involves updating to the latest available version of the Modern Events Calendar plugin where the authorization flaw has been addressed. Additionally, organizations should implement network-level monitoring to detect unusual access patterns or unauthorized attempts to access administrative functions within the calendar system. Security teams should also conduct comprehensive access control reviews to ensure that proper user role assignments are in place and that the system enforces appropriate privilege levels. The remediation process should include verifying that all administrative functions properly validate user credentials and permissions before executing any operations. Organizations may also consider implementing additional security layers such as web application firewalls or intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability, aligning with ATT&CK technique T1078 which addresses valid accounts and privilege escalation through unauthorized access to systems.