CVE-2026-16063 in Event Booking Manager Plugin
Summary
by MITRE • 08/02/2026
The Event Booking Manager for WooCommerce WordPress plugin before 5.3.7 does not sanitise or escape event timeline content submitted by users with post-editing access before storing it and rendering it on the public event page, allowing users with the Author role and above to inject arbitrary JavaScript that executes in the browser of any visitor viewing the event, including administrators.
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Analysis
by VulDB Data Team • 08/02/2026
The Event Booking Manager for WooCommerce WordPress plugin version 5.3.6 and earlier contains a critical cross-site scripting vulnerability that stems from insufficient input sanitization and output escaping mechanisms within its event timeline content handling functionality. This vulnerability affects users with the Author role and above, granting them the ability to inject malicious javascript code into event timeline elements that are subsequently rendered on public event pages. The flaw represents a classic persistent cross-site scripting vulnerability where user-supplied content is stored in the database without proper sanitization and then executed in the browser context of any visitor accessing the affected page. The security implications extend beyond regular users to include administrators who may inadvertently view compromised event pages, creating a significant risk for privilege escalation and potential system compromise.
The technical nature of this vulnerability aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') and specifically demonstrates weaknesses in the plugin's data validation and output encoding processes. The vulnerability exists because the plugin fails to implement proper sanitization routines when processing timeline content submitted by users who possess post-editing capabilities. This allows malicious actors to inject javascript payloads that execute within the browser context of other users, including administrators with elevated privileges. The attack vector is particularly dangerous as it leverages legitimate user permissions to bypass security controls, making detection more challenging and exploitation more effective.
The operational impact of this vulnerability creates a significant risk for WordPress site owners and their visitors. Any user with Author role or higher can craft malicious timeline content that will execute automatically when other users view the event page, potentially leading to session hijacking, credential theft, or further exploitation through browser-based attacks. Administrators viewing compromised pages become potential targets for privilege escalation attacks, as the injected javascript can manipulate browser sessions and access restricted administrative functions. The persistent nature of the vulnerability means that once exploited, the malicious code remains active until the timeline content is manually removed or the plugin is updated to a secure version.
Mitigation strategies should focus on immediate remediation through updating to Event Booking Manager version 5.3.7 or later, which addresses the sanitization and escaping issues in the timeline content handling. Additionally, administrators should implement proper input validation at multiple levels including server-side sanitization of all user-submitted content before database storage and comprehensive output encoding when rendering content on public pages. Network-level protections such as web application firewalls can provide additional defense-in-depth, though the primary fix must address the root cause within the plugin's codebase. Security monitoring should include regular audit of user-generated content in event timeline fields to detect potential malicious injections. Organizations should also consider implementing role-based access controls that limit which users can modify event timeline content, reducing the attack surface for this specific vulnerability while maintaining core functionality.