EUVD-2026-37980
GHSA-vgc7-h39p-hg9j
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires a victim to visit the affected page (UI:R); all other metrics match the published vector, with S:C reflecting browser-context escape.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AnalysisAI
Stored Cross-Site Scripting in the Creavi Appointment Booking Calendar plugin for WordPress (all versions through 1.4.4) allows authenticated attackers holding Author-level access or higher to permanently inject arbitrary JavaScript via unsanitized custom booking field labels. The malicious payload executes in the browser of any user who subsequently visits a page containing the injected booking form, enabling session hijacking, credential harvesting, or malicious redirects against site visitors and administrators alike. No confirmed active exploitation (not in CISA KEV) and no public exploit code has been identified at time of analysis, though a fix commit is available in the WordPress plugin Trac repository.
Technical ContextAI
The vulnerability resides in the plugin's client-side booking logic, specifically in the JavaScript file at assets/js/booking.js around line 379, as confirmed by the Trac browser reference. The affected product is identified by CPE cpe:2.3:a:creavi:creavi_appointment_booking_calendar:*:*:*:*:*:*:*:* covering all versions. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), a classic stored XSS pattern in which user-supplied text - here, custom booking field labels configurable by authenticated users - is persisted to the database without adequate input sanitization and later reflected into HTML/JavaScript output without proper output escaping. The scope change (S:C in CVSS) reflects the classic XSS browser-context escape: the exploit's impact falls on the victim's browser session, not solely the WordPress server. The WordPress Author role is the minimum required, meaning any contributor with post-authoring capability could be the threat actor.
RemediationAI
Upstream fix available via WordPress plugin Trac changeset 3564451 (https://plugins.trac.wordpress.org/changeset/3564451/creavi-booking-service); however, a specific patched release version number is not independently confirmed from the available data - administrators should check the WordPress plugin repository for an updated release beyond 1.4.4 and upgrade immediately upon availability. As a compensating control, site administrators can restrict the WordPress Author and Contributor roles to only fully trusted internal users, preventing untrusted parties from accessing the booking field label configuration - note this may limit editorial workflows. Alternatively, a WAF rule targeting script injection patterns in booking field input parameters can provide partial mitigation, though WAF bypass is possible and should not substitute for patching. Disabling the custom booking field label feature entirely, if the plugin allows it, eliminates the injection vector with the trade-off of reduced booking form customization. Monitor the Wordfence advisory and WordPress plugin changelog for the official patched version.
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External POC / Exploit Code
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