CVE-2026-97285 in The Events Calendar Plugin
Summary
by MITRE • 09/30/2026
Contributor Broken Access Control in The Events Calendar <= 6.17.5 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as broken access control within The Events Calendar plugin, affecting versions up to and including 6.17.5, represents a critical security flaw that undermines the fundamental principle of least privilege expected in WordPress environments. This issue stems from insufficient verification of user permissions during specific administrative operations, allowing authenticated users with lower-level roles, such as contributors or editors, to perform actions reserved exclusively for administrators. In typical WordPress architectures, role-based access control is enforced through capability checks that determine whether a current user possesses the necessary privileges before executing sensitive functions. However, in this instance, the plugin fails to adequately validate these capabilities when handling requests related to event management and configuration settings, thereby creating an authorization bypass scenario.
From a technical perspective, the flaw likely resides in the server-side logic processing AJAX requests or form submissions associated with calendar configurations, ticketing systems, or external service integrations managed by the plugin. When a user submits data intended for administrative setup, such as modifying API keys, changing payment gateway settings, or altering global event display parameters, the application does not strictly enforce that the requester holds an administrator role. This oversight allows malicious actors who have obtained contributor-level access to escalate their privileges effectively without needing to compromise higher-privileged accounts directly. The absence of proper authorization checks means that any authenticated user can manipulate core plugin behaviors and settings, leading to unauthorized modifications of site-wide configurations.
The operational impact of this vulnerability is significant for website owners relying on The Events Calendar for business-critical activities such as ticket sales or event registration. An attacker exploiting this flaw could disrupt the functionality of paid tickets by altering pricing structures, disabling payment gateways, or modifying refund policies without authorization. Furthermore, if the plugin integrates with third-party services like Google Maps or Stripe, an attacker might inject malicious API keys or redirect webhooks to external servers controlled by them. This could lead to data exfiltration, financial fraud through manipulated transaction records, or complete denial of service for event attendees attempting to register. The integrity of the entire booking and ticketing workflow is compromised because the system cannot trust that configuration changes originate from legitimate administrators.
This vulnerability aligns with CWE-269, which describes Improper Privilege Control, where a user can act outside their intended permissions. In terms of offensive security frameworks, it maps to MITRE ATT&CK technique T1078, Valid Accounts, specifically the sub-category of Local Account Manipulation or Access Token Manipulation in broader contexts, as attackers leverage existing valid credentials with insufficiently restricted roles to gain higher-level access. It also relates to CWE-639, Authorization Bypass Through User-Controlled Key, if the exploit involves manipulating request parameters that dictate administrative actions. The persistence of this issue highlights a common challenge in plugin development where convenience or performance optimizations sometimes lead to skipped security checks during rapid iteration cycles.
Mitigation strategies must prioritize immediate remediation through software updates and rigorous access control auditing. Site administrators should upgrade The Events Calendar to version 6.17.6 or later, which contains the necessary patches for these authorization checks. Until an update is applied, it is advisable to restrict contributor-level accounts strictly to content creation tasks that do not interact with administrative settings pages. Implementing a Web Application Firewall can provide an additional layer of defense by monitoring and blocking suspicious patterns associated with privilege escalation attempts, such as repeated failed requests or unusual parameter manipulation in AJAX endpoints. Regular security audits focusing on role-based access control mechanisms across all installed plugins are essential to prevent similar vulnerabilities from being exploited in the future.