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.
References10
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.4…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.5…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.5…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.5…
- plugins.trac.wordpress.org/browser/blocksy-companion/tags/2.1.5…
- plugins.trac.wordpress.org/changeset/3636709/blocksy-companion/…
- plugins.trac.wordpress.org/changeset?old_path=%2Fblocksy-compan…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 36 · as of 8 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.