# CVE-2026-81660: Groundhogg CRM unauthenticated stored cross-site scripting in web form fields

Source: https://junglewise.ai/threats/cve-2026-81660-groundhogg-crm-unauthenticated-stored-cross-site-scripting-in-web  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-30. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-81660 · Severity: high · CVSS 8.8 · Published 2026-08-30

The Groundhogg WordPress plugin is a customer relationship management and marketing automation tool used by businesses to manage contacts, newsletters, and campaigns. An unauthenticated attacker can inject malicious scripts into web form fields that are stored in the plugin's database and executed when administrators view the data, potentially allowing the attacker to compromise admin accounts and access sensitive customer information.

Technologies: [Groundhogg — CRM, Newsletters, and Marketing Automation](https://junglewise.ai/threats/technologies/groundhogg-crm-newsletters-and-marketing-automation). Vendors: [Groundhogg](https://junglewise.ai/threats/vendors/groundhogg).

## Quick answers

**Is CVE-2026-81660 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81660 being exploited in the wild.

**How severe is CVE-2026-81660?** High severity, with a CVSS score of 8.8, published 30 August 2026.

**Which products and versions are affected?** Groundhogg — CRM, Newsletters, and Marketing Automation before 4.5.13.

**Is there a fix for CVE-2026-81660?** A patch was published on 2026-08-30: Fixed in version 4.5.13 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-81660 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-81660?** Check whether you run Groundhogg — CRM, Newsletters or and Marketing Automation at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Groundhogg plugin before version 4.5.13 suffers from a stored cross-site scripting (XSS) vulnerability in its web form functionality. The vulnerability exists because the plugin fails to properly validate and escape user-supplied data submitted to certain optional web form fields (specifically dropdown and radio fields) before storing and re-displaying the data in the WordPress administrative area. An unauthenticated attacker can submit malicious JavaScript code through these form fields; when an administrator later views the submitted form data in the admin dashboard, the unescaped script executes in their browser session. This allows attackers to steal admin credentials, session tokens, or perform unauthorized actions. The issue was patched in version 4.5.13.

## Affected products

- Groundhogg Groundhogg — CRM, Newsletters, and Marketing Automation before 4.5.13

## Timeline

- 2026-08-28: disclosed
- 2026-08-30: patched: Fixed in version 4.5.13

## References

- [https://wpscan.com/vulnerability/cfdb4107-6010-4c29-baf3-3111765f48c2/](https://wpscan.com/vulnerability/cfdb4107-6010-4c29-baf3-3111765f48c2/)

## Related threats

- [Groundhogg arbitrary file deletion via copy_file](https://junglewise.ai/threats/cve-2026-109221-the-groundhogg-crm-newsletters-and-marketing-automation-plugin)
- [Groundhogg privilege escalation via contact user reassignment](https://junglewise.ai/threats/cve-2026-104725-the-groundhogg-crm-newsletters-and-marketing-automation-plugin)
- [Groundhogg privilege escalation via contact identity rebinding](https://junglewise.ai/threats/cve-2026-97644-the-groundhogg-crm-newsletters-and-marketing-automation-plugin)