CVE-2026-81660 Groundhogg < 4.5.13 - Unauthenticated Stored XSS via Web Form Dropdown/Radio Field
Unauthenticated attackers can inject malicious scripts via web form fields, leading to stored XSS attacks against high-privilege users in the Groundhogg WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81660?
CVE-2026-81660 is a high-severity cross-site scripting vulnerability in Unknown Groundhogg — CRM, Newsletters, and Marketing Automation, published on 30 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before 4.5.13 does not validate or escape values submitted to some optional web form fields before storing them and outputting them back in an administrative area, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against high privilege users.
Weakness: CWE-79
Which versions are affected by CVE-2026-81660?
How do I fix CVE-2026-81660?
No fix has been published for CVE-2026-81660 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-2026-81660 being exploited?
There is no known exploitation of CVE-2026-81660 in the wild and no public exploit code.
Sources
Also known as GHSA-c4g6-w433-v47v.