CVE-2026-100107 extendthemes CVE debrief

Who should care

Defenders responsible for WordPress installations using the Kubio AI Page Builder plugin, especially if the plugin version is 2.9.2 or earlier, should assess exposure and take steps to update or mitigate as necessary.

Why it matters

The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting, allowing unauthenticated attackers to inject arbitrary web scripts. Defenders should prioritize verifying exposure and take steps to update or mitigate as necessary.

• Unauthenticated attackers can inject arbitrary web scripts
• Injected scripts execute when a user accesses an injected page
• Defenders must verify exposure of WordPress installations
• Remediation requires updating or mitigating the vulnerable plugin

Technical summary

The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 2.9.2. The vulnerability exists due to insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts. Defenders should prioritize verifying exposure of WordPress installations using the Kubio AI Page Builder plugin, especially if the plugin version is 2.9.2 or earlier, and take steps to update or mitigate as necessary. This vulnerability could allow attackers to inject malicious scripts, potentially leading to unauthorized actions or data breaches. It is crucial for defenders to assess their systems

Defensive priority

Defenders should prioritize verifying exposure of WordPress installations using the Kubio AI Page Builder plugin, especially if the plugin version is 2.9.2 or earlier, and take steps to update or mitigate as necessary.

Recommended defensive actions

• Verify WordPress installations for the Kubio AI Page Builder plugin version 2.9.2 or earlier
• Update the plugin to a version that addresses the vulnerability, if available
• Implement input sanitization and output escaping for the 'comment' parameter
• Monitor for potential exploitation attempts
• 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.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. However, the corpus does not establish versions beyond 2.9.2, exploitation, impact, or remediation, which require verification from the supplied official sources.

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.