CVE-2026-105890 Liquid Web / StellarWP CVE debrief

Who should care

Defenders responsible for WordPress environments using the Gutenberg Blocks by Kadence Blocks plugin version <= 3.7.12 should assess exposure and prioritize verification and updates.

Why it matters

Defenders should prioritize verifying and updating the Gutenberg Blocks by Kadence Blocks plugin to version 3.7.12.1 or later, and assess exposure in their WordPress environments due to the Cross Site Scripting (XSS) vulnerability.

• Verification of plugin version and exposure in WordPress environments
• Potential XSS attacks on affected versions
• Prioritization of updates to version 3.7.12.1 or later

Technical summary

The Gutenberg Blocks by Kadence Blocks plugin version <= 3.7.12 has a Cross Site Scripting (XSS) vulnerability. The vendor, Liquid Web / StellarWP, has provided information on the affected version and the fixed version 3.7.12.1. This vulnerability allows for Stored XSS attacks, and defenders should prioritize verifying and updating the plugin to the fixed version. The affected product is used in WordPress environments, and exposure should be assessed and mitigated accordingly. The CVE record provides details on the vulnerability and its impact.

Defensive priority

Defenders should prioritize verifying and updating the Gutenberg Blocks by Kadence Blocks plugin to version 3.7.12.1 or later, and assess exposure in their WordPress environments.

Recommended defensive actions

• Verify and update the Gutenberg Blocks by Kadence Blocks plugin to version 3.7.12.1 or later
• Assess exposure in WordPress environments
• Monitor for potential XSS attacks
• 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 source item provide details on the Cross Site Scripting (XSS) vulnerability in Gutenberg Blocks by Kadence Blocks plugin version <= 3.7.12. The vendor, Liquid Web / StellarWP, has provided information on the affected version and the fixed version 3.7.12.1.

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.