CVE-2026-18488 Cross-site scripting in Blocksy Companion
Authenticated attackers with author access can inject arbitrary scripts via the tagName attribute, leading to stored XSS execution on victim pages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18488?
CVE-2026-18488 is a medium-severity cross-site scripting vulnerability in creativethemeshq Blocksy Companion, published on 1 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-18488?
How do I fix CVE-2026-18488?
No fix has been published for CVE-2026-18488 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-18488 being exploited?
There is no known exploitation of CVE-2026-18488 in the wild and no public exploit code.
Sources
Also known as GHSA-r3pj-hg4c-pv8w.