{"id":"CVE-2026-111727","aliases":[],"title":"Appointment Booking Calendar <= 1.4.05 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'vs_text_submitbtn' Parameter","titleSource":"Wordfence","descriptionSource":"Wordfence","products":[{"vendor":"codepeople","name":"Appointment Booking Calendar","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.4.05","versionType":"semver"}],"defaultStatus":"unaffected","source":"Wordfence","url":"https://www.cve.org/CVERecord?id=CVE-2026-111727"}],"remediation":[],"description":"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above.","severity":"medium","score":6.4,"published":"2026-10-28T03:42:54.736Z","modified":"2026-10-28T03:42:54.736Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/dd0e4753-222a-421f-a830-58f6af055dd8?source=cve","https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_scheduler.inc.php#L194","https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L690","https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L102","https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_go.inc.php#L616","https://plugins.trac.wordpress.org/browser/appointment-booking-calendar/tags/1.4.05/inc/cpabc_apps_on.inc.php#L398","https://plugins.trac.wordpress.org/log/appointment-booking-calendar/","https://plugins.trac.wordpress.org/changeset/3750835/appointment-booking-calendar/trunk/inc/cpabc_scheduler.inc.php"],"sources":[{"name":"CVE","id":"CVE-2026-111727","modified":"2026-10-28T03:42:54.736Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-111727"}],"assessments":[{"source":"Wordfence","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","score":6.4}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T22:30:31.386Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}