CVE-2026-18548 Groundhogg <= 4.5.14 - Unauthenticated Stored Cross-Site Scripting via 'ref' Parameter
Unauthenticated attackers can inject arbitrary scripts via the 'ref' parameter, leading to code execution when users visit affected pages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18548?
CVE-2026-18548 is a high-severity cross-site scripting vulnerability in trainingbusinesspros Groundhogg — CRM, Newsletters, and Marketing Automation, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ref' parameter in all versions up to, and including, 4.5.14 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers 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-2026-18548?
How do I fix CVE-2026-18548?
No fix has been published for CVE-2026-18548 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-2026-18548 being exploited?
There is no known exploitation of CVE-2026-18548 in the wild and no public exploit code.
Sources
Also known as GHSA-x57v-8jrr-596c.