CVE-2026-111727
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vs_text_submitbtn' parameter in versions up to 1.4.05. Due to insufficient input sanitization and output escaping, an authenticated attacker with Subscriber-level access or higher can inject arbitrary web scripts that execute when a user accesses an injected page. This requires the attacker to be assigned as a calendar owner.
Risk Assessment
Potential execution of malicious scripts in users' browsers (including administrators), leading to session theft, account takeover, or website content modification.
Recommendation
Update the Appointment Booking Calendar plugin to a version later than 1.4.05 and restrict calendar owner assignment to trusted users.
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Original NVD description (English source)
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vs_text_submitbtn' parameter in all versions up to, and including, 1.4.05 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to be assigned as a calendar owner, a per-user grant that any administrator can extend to users as low as Subscriber level through the plugin's calendar list screen. Exploitation by attackers with subscriber-level access and above requires that an administrator has assigned the attacker's account as owner (`conwer`) of a calendar via the plugin's calendar list screen; the plugin's UI lists all registered users regardless of role, so a Subscriber can be assigned. On a default installation, where that is not configured, the vulnerability requires attackers with editor-level access and above.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS