CVE-2026-5513
Received Received - Intake
Stored XSS in Bookly WordPress Plugin

Publication date: 2026-06-13

Last updated on: 2026-06-13

Assigner: Wordfence

Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'bookly-customer-full-name' cookie in versions up to, and including, 27.2 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. Exploitation requires 'Remember personal information in cookies' setting to be enabled (disabled by default).
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Meta Information
Published
2026-06-13
Last Modified
2026-06-13
Generated
2026-06-13
AI Q&A
2026-06-13
EPSS Evaluated
N/A
NVD
CVE-2026-5513
EUVD
EUVD-2026-36651
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
bookly bookly to 27.2 (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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Impact Analysis

This vulnerability can allow unauthenticated attackers to execute arbitrary scripts in the context of the affected website. This can lead to theft of user data, session hijacking, defacement of the website, or other malicious actions performed on behalf of the user.

Because the vulnerability is a Stored Cross-Site Scripting issue, the malicious script persists and affects any user who visits the injected page, potentially compromising multiple users.

Executive Summary

The vulnerability exists in the Online Scheduling and Appointment Booking System – Bookly plugin for WordPress, specifically in versions up to and including 27.2. It is a Stored Cross-Site Scripting (XSS) vulnerability that occurs via the 'bookly-customer-full-name' cookie. This happens because the plugin does not properly sanitize input or escape output, allowing attackers to inject malicious web scripts.

When exploited, these injected scripts execute whenever a user accesses a page containing the malicious code. The attack requires the 'Remember personal information in cookies' setting to be enabled, which is disabled by default.

Mitigation Strategies

To mitigate this vulnerability, ensure that the 'Remember personal information in cookies' setting is disabled, as it is disabled by default and required for exploitation.

Additionally, update the Bookly plugin for WordPress to a version later than 27.2 where this vulnerability is fixed.

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