{"affected":[{"defaultStatus":"unaffected","product":"Stackable – Page Builder Gutenberg Blocks","source":"CNA: Wordfence","vendor":"bfintal","versions":[{"lessThanOrEqual":"3.19.9","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-9601","cwes":["CWE-79"],"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.4,"severity":"medium","source":"CNA: Wordfence","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},{"score":6.4,"severity":"medium","source":"NVD: security@wordfence.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","version":"3.1"}],"modifiedAt":1794028743550,"publishedAt":1794025632469,"references":[{"source":"CNA: Wordfence","tags":[],"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/1d4da874-23c8-4df4-b776-6046ce8d705a?source=cve"},{"source":"CNA: Wordfence","tags":[],"url":"https://plugins.trac.wordpress.org/browser/stackable-ultimate-gutenberg-blocks/tags/3.19.6/src/deprecated/block-defaults/custom-block-styles.php#L223"},{"source":"CNA: 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Wordfence","retrievedAt":1794028417058,"url":"https://www.cve.org/CVERecord?id=CVE-2026-9601"},{"modifiedAt":1794028743550,"name":"NVD","retrievedAt":1794032229013,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9601"}],"ssvc":null,"status":"published","title":"Stackable <= 3.19.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'save' Parameter","updatedAt":1794032229013}