CVE-2026-92561 wpdevelop CVE debrief

Who should care

Defenders responsible for WordPress installations with the Booking Calendar plugin should assess exposure and prioritize verification and remediation efforts. This includes reviewing the plugin's configuration, ensuring that input sanitization and output escaping are properly implemented, and monitoring for potential exploitation attempts. Additionally, defenders should verify and update the Booking Calendar plugin to a fixed version, if available, and be

Why it matters

The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting, allowing unauthenticated attackers to inject arbitrary web scripts. Defenders should prioritize verifying and updating the plugin, ensuring proper input sanitization and output escaping, and monitoring for potential exploitation attempts.

• Unauthenticated attackers may 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 vulnerability has a CVSS score of 6.1 and a Medium severity level.
• Defenders should verify and update the Booking Calendar plugin to a fixed version, if available, and ensure that input sanitization and output escaping are properly implemented.
• 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.

Technical summary

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.

Defensive priority

Defenders should prioritize verifying and updating the Booking Calendar plugin to a fixed version, if available, and ensure that input sanitization and output escaping are properly implemented.

Recommended defensive actions

• Verify and update the Booking Calendar plugin to a fixed version, if available.
• Ensure that input sanitization and output escaping are properly implemented for the 'options' parameter.
• Monitor for potential exploitation attempts and implement compensating controls as needed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and vector. However, the corpus does not establish versions, exploitation, impact, or remediation beyond the provided information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.