PatchSiren cyber security CVE debrief
CVE-2026-5513 ladela CVE debrief
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).
- Vendor
- ladela
- Product
- Online Scheduling and Appointment Booking System – Bookly
- CVSS
- HIGH 7.2
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-13
- Original CVE updated
- 2026-06-13
- Advisory published
- 2026-06-13
- Advisory updated
- 2026-06-13
Who should care
Users of the Online Scheduling and Appointment Booking System – Bookly plugin for WordPress, particularly those with versions up to and including 27.2, should be aware of this vulnerability and take steps to mitigate it.
Technical 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 caused by insufficient input sanitization and output escaping of the 'bookly-customer-full-name' cookie, allowing unauthenticated attackers to inject arbitrary web scripts.
Defensive priority
HIGH
Recommended defensive actions
- Update the Online Scheduling and Appointment Booking System – Bookly plugin to a version beyond 27.2.
- Ensure the 'Remember personal information in cookies' setting is disabled if not required.
Evidence notes
The CVE-2026-5513 record and associated details were sourced from official vulnerability databases and sources.
Official resources
CVE-2026-5513 was published on 2026-06-13T12:16:15.947Z and has not been modified since.