CVE-2025-9346 in Booking Calendar Plugin
Summary
by MITRE • 08/28/2025
The Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via settings in all versions up to, and including, 10.14.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 08/30/2025
The vulnerability identified as CVE-2025-9346 affects the Booking Calendar plugin for WordPress, representing a critical stored cross-site scripting flaw that has been present in all versions up to and including 10.14.1. This type of vulnerability falls under the category of CWE-79 Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows malicious code execution. The flaw specifically resides in the plugin's handling of user input within its settings configuration, where inadequate sanitization and escaping mechanisms fail to properly filter malicious content before it is stored and subsequently rendered in web pages.
The technical nature of this vulnerability stems from the plugin's failure to implement proper input validation and output encoding when processing administrative settings. Attackers with Administrator-level privileges or higher can exploit this weakness by injecting malicious JavaScript code through the plugin's configuration interface. Once the malicious payload is stored within the plugin's settings, it becomes persistent and executes every time affected pages are accessed by any user, regardless of their privilege level. This stored nature of the vulnerability makes it particularly dangerous as the malicious code can affect multiple users over time without requiring repeated exploitation attempts.
The operational impact of CVE-2025-9346 extends beyond simple script execution, as it provides attackers with potential access to sensitive administrative functions and user data. The vulnerability aligns with ATT&CK technique T1548.002 Account Manipulation, as authenticated attackers can leverage their elevated privileges to establish persistent malicious presence within the WordPress environment. Additionally, this flaw can facilitate further attacks such as credential theft, session hijacking, or redirection to malicious sites, making it a prime target for attackers seeking to compromise the entire WordPress installation. The vulnerability's presence in a widely used booking plugin means that organizations with multiple administrators are particularly at risk, as a single compromised account can lead to widespread exploitation.
Mitigation strategies for CVE-2025-9346 should include immediate plugin updates to versions that address the stored XSS vulnerability, as recommended by the plugin vendor and security advisories. Organizations should also implement additional security measures such as role-based access control restrictions, limiting administrative privileges to only essential personnel, and implementing web application firewalls to detect and block malicious payloads. Regular security audits of WordPress plugins and themes are essential to identify similar vulnerabilities, while security monitoring should be enhanced to detect unusual administrative activities that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input sanitization and output escaping practices as outlined in OWASP Top Ten and the principle of defense in depth, where multiple security layers protect against different types of attacks.