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CVE-2026-18435 stellarwp CVE debrief

The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'toggleIcon' Block Attribute in all versions up to, and including, 3.7.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The CVE record was published on 2026-08-01T09:17:02.383Z and has not been modified since then. Affected product deployments should be reviewed for potential exposure, and administrators should verify installed plugin versions and restrict contributor-level access to trusted users.

Vendor
stellarwp
Product
Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
CVSS
MEDIUM 6.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-01
Original CVE updated
2026-08-01
Advisory published
2026-08-01
Advisory updated
2026-08-01

Who should care

WordPress administrators and users with contributor-level access and above who have installed the Kadence Blocks plugin, especially those with high-value targets or sensitive information on their sites, should review and verify installed plugin versions, restrict contributor-level access to trusted users, and monitor for suspicious page modifications and script injections.

Technical summary

The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'toggleIcon' Block Attribute in all versions up to, and including, 3.7.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability exists in all versions up to, and including, 3.7.8, and the CVSS score is 6.4, with a severity of MEDIUM.

Defensive priority

Authenticated attackers with contributor-level access could inject web scripts via the 'toggleIcon' Block Attribute in the Kadence Blocks plugin.

Recommended defensive actions

  • Inventory and verify installed Kadence Blocks plugin versions
  • Restrict contributor-level access and above to trusted users
  • Monitor for suspicious page modifications and script injections
  • Apply vendor patches or updates when available
  • Implement additional security measures such as Web Application Firewall (WAF) rules
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record indicates a Stored Cross-Site Scripting vulnerability in the Kadence Blocks plugin for WordPress. The vulnerability exists in all versions up to, and including, 3.7.8. Authenticated attackers with contributor-level access and above can inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The CVSS score is 6.4, and the severity is MEDIUM.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-18435 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-18435

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-18435 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-18435

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/blocks/class-kadence-blocks-table-of-contents-block.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/class-kadence-blocks-table-of-contents.php

    [email protected]

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.