Medium severity6.4NVD Advisory· Published Sep 1, 2026· Updated Sep 1, 2026
CVE-2026-18488
CVE-2026-18488
Description
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=2.1.51
Patches
Vulnerability mechanics
References
11- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/block.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/views/wp-field.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/framework/features/blocks/dynamic-data/views/wp-field.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4/static/js/editor/blocks/dynamic-data/block.jsonnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/block.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/views/wp-field.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/framework/features/blocks/dynamic-data/views/wp-field.phpnvd
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.51/static/js/editor/blocks/dynamic-data/block.jsonnvd
- plugins.trac.wordpress.org/changeset/3636709/blocksy-companion/trunk/framework/features/blocks/dynamic-data/views/wp-field.phpnvd
- plugins.trac.wordpress.org/changesetnvd
- www.wordfence.com/threat-intel/vulnerabilities/id/e0d0adcc-6741-4cab-aaba-df356691a1eenvd
News mentions
2- Wordfence Intelligence Weekly WordPress Vulnerability Report (August 31, 2026 to September 6, 2026)Wordfence Blog · Sep 10, 2026
- WordPress: 25 Plugin Vulnerabilities Disclosed Together, Ranging from SQLi to Critical FlawsVypr Intelligence · Sep 1, 2026