CVE-2026-18843 The Beaver Builder Team CVE debrief

Who should care

Defenders responsible for WordPress installations with the Beaver Builder Plugin (Starter Version) plugin should assess exposure and prioritize verification and potential updates. This includes operators, platform administrators, vulnerability management teams, and security teams. They should verify the plugin version and update to a fixed version, if available, and monitor for potential attacks.

Why it matters

The CVE-2026-18843 vulnerability in the Beaver Builder Plugin (Starter Version) for WordPress allows unauthenticated attackers to inject arbitrary web scripts, potentially leading to Cross-Site Scripting attacks. Defenders should prioritize verifying and updating the plugin, monitoring for potential attacks, and implementing additional security measures.

• 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
• Defenders should verify and update the plugin to a fixed version, if available

Technical summary

The Beaver Builder Plugin (Starter Version) plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via 'no_results_message' node_preview Parameter in all versions up to, and including, 2.11.0.1 due to insufficient input sanitization and output escaping. This vulnerability allows unauthenticated attackers to inject arbitrary web scripts, potentially leading to Cross-Site Scripting attacks. The vulnerability is confirmed to affect versions up to and including 2.11.0.1. Defenders should prioritize verifying and updating the plugin to a fixed version, if available.

Defensive priority

Defenders should prioritize verifying and updating the plugin to a fixed version, if available, and monitor for potential attacks.

Recommended defensive actions

• Verify the plugin version and update to a fixed version, if available
• Monitor for potential attacks and suspicious activity
• Implement additional security measures, such as input validation and output escaping
• 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. However, the corpus does not establish versions, exploitation, impact, or remediation beyond vendor statements. Defenders should verify the plugin version and update to a fixed version, if available, and monitor for potential attacks. The vulnerability is confirmed to affect versions up to and including 2.11.0.1. Limited evidence is available on exploitation and impact.

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.