LatePoint <= 5.3.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Strategic Overview
- Status
- Patched in 5.4.0
- Affected Version
<= 5.3.2- CVSS
- 6.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-5391
At a glance
CVE-2026-5391 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Appointment Booking Plugin WordPress plugin, affecting versions <= 5.3.2. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 5.4.0; sites on affected versions should update now. Disclosed August 2026, reported by alex_henry20.
Vulnerability Overview
The LatePoint plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'btn_wrapper_classes' attribute of the 'latepoint_resources' shortcode in all versions up to, and including, 5.3.2. This is due to insufficient input sanitization and output escaping in the 'locations' branch of the 'shortcode_latepoint_resources' function. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Appointment Booking Plugin <= 5.3.2 carries this weakness at btn_wrapper_classes, and reaching it takes an account at Contributor level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Appointment Booking Plugin the fix is 5.4.0: builds <= 5.3.2 are affected, anything from 5.4.0 onward is not.
Remediation
Update to version 5.4.0, or a newer patched version
How WordSec helps
An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Appointment Booking Plugin 5.4.0 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
- 9.8CVE-2025-6715: LatePoint <= 5.1.93 Local File Inclusion
CVE-2025-6715 - 9.8CVE-2024-8943: LatePoint <= 5.0.12 Authentication Bypass
CVE-2024-8943 - 9.8CVE-2024-8911: LatePoint <= 5.0.11 Arbitrary User Password Change
CVE-2024-8911 - 9.1CVE-2024-2472: LatePoint Missing Authorization and Info Exposure
CVE-2024-2472 - 8.8CVE-2026-13228: LatePoint Privilege Escalation to Administrator
CVE-2026-13228 - 8.8CVE-2026-49083: LatePoint Privilege Escalation
CVE-2026-49083 - 8.8CVE-2026-6741: LatePoint Privilege Escalation to Administrator
CVE-2026-6741 - 8.8CVE-2026-1566: LatePoint <= 5.2.7 Privilege Escalation
CVE-2026-1566
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