CVE-2026-13424
Received Received - Intake

Stored XSS in Bookly WordPress Plugin via Unauthenticated AJAX Action

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: Wordfence

Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action in all versions up to, and including, 27.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injection point is the bookly_speed_up_update_addons AJAX action, which is registered as wp_ajax_nopriv_* and therefore reachable without authentication; the payload is stored verbatim in the bookly_log.details column when a request is submitted without a valid signature, and executes when an administrator later views the Diagnostics → Logs page.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-13424
EUVD
EUVD-2026-59927

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
bookly bookly to 27.7 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Online Scheduling and Appointment Booking System – Bookly plugin for WordPress. It exists in versions up to 27.7 due to insufficient input sanitization and output escaping in the bookly_speed_up_update_addons AJAX action. Attackers can inject malicious scripts without authentication, which execute when an administrator views the Diagnostics Logs page.

Detection Guidance

Check WordPress plugin logs for suspicious entries in bookly_log.details via the Diagnostics → Logs page. Monitor AJAX requests to bookly_speed_up_update_addons without valid signatures.

Impact Analysis

Unauthenticated attackers can inject malicious scripts into your WordPress site. These scripts execute when an administrator accesses the Logs page, potentially allowing attackers to steal sensitive data, perform actions on behalf of users, or deface your website.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR and HIPAA compliance requirements for data protection and confidentiality. It may result in data breaches, unauthorized disclosures, and failure to meet regulatory standards for safeguarding sensitive information.

Mitigation Strategies

Update the Bookly plugin to the latest version beyond 27.7. Disable the bookly_speed_up_update_addons AJAX action if not needed. Review logs for signs of exploitation and remove any malicious scripts.

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