CVE-2026-92561 Booking Calendar <= 11.8.2 - Reflected Cross-Site Scripting via 'options' Parameter
Unauthenticated attackers can inject arbitrary scripts via the options parameter in the Booking Calendar WordPress plugin, requiring user interaction to execute.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-92561?
CVE-2026-92561 is a medium-severity cross-site scripting vulnerability in wpdevelop Booking Calendar, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'options' parameter in all versions up to, and including, 11.8.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The nonce check is bypassed by default because the 'booking_is_nonce_at_front_end' option ships disabled, allowing unauthenticated requests to reach the vulnerable sink without any verification.
Weakness: CWE-79
Which versions are affected by CVE-2026-92561?
How do I fix CVE-2026-92561?
No fix has been published for CVE-2026-92561 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-2026-92561 being exploited?
There is no known exploitation of CVE-2026-92561 in the wild and no public exploit code.
Sources
Also known as GHSA-c528-79h7-4x96.