Vulnerability Description
The Stackable – Page Builder Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'update_block_style' endpoint in all versions up to, and including, 3.19.9 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/gambitph/Stackable/pull/3725
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/t
- https://plugins.trac.wordpress.org/changeset/3609541/stackable-ultimate-gutenber
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1d4da874-23c8-4df4-b77
FAQ
What is CVE-2026-9601?
CVE-2026-9601 is a vulnerability with a CVSS score of 6.4 (MEDIUM). The Stackable – Page Builder Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'update_block_style' endpoint in all versions up to, and including, 3.19.9 due t...
How severe is CVE-2026-9601?
CVE-2026-9601 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-9601?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.