CVE-2026-5513 Cross-site scripting in Online Scheduling and Appointment Booking System – Bookly
Unauthenticated attackers can inject arbitrary scripts via a cookie in the Bookly WordPress plugin, requiring a specific non-default setting to be enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5513?
CVE-2026-5513 is a high-severity cross-site scripting vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 13 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-79
Which versions are affected by CVE-2026-5513?
How do I fix CVE-2026-5513?
No fix has been published for CVE-2026-5513 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-5513 being exploited?
There is no known exploitation of CVE-2026-5513 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Sources
Also known as GHSA-pfrr-cpcq-w8m8.