CVE-2026-81660

Deferred Deferred - Pending Action

Stored XSS in Groundhogg WordPress Plugin

Publication date: 2026-08-30

Last updated on: 2026-08-31

Assigner: WPScan

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-30

Last Modified

2026-08-31

Generated

2026-09-19

AI Q&A

2026-08-30

EPSS Evaluated

2026-09-15

NVD

CVE-2026-81660

EUVD

EUVD-2026-68159

Affected Vendors & Products

Vendor	Product	Version / Range
groundhogg	groundhogg	to 4.5.13 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a stored cross-site scripting (XSS) flaw in the Groundhogg WordPress plugin versions before 4.5.13. It allows unauthenticated users to inject malicious scripts via unvalidated web form fields, which are then stored and executed when high-privilege users access the admin area.

Detection Guidance

Check if your Groundhogg plugin version is below 4.5.13. Inspect web forms for dropdown and radio fields that may accept unvalidated user input. Look for unusual script content in form submissions or administrative areas.

Impact Analysis

An attacker could exploit this to execute arbitrary scripts in the browsers of high-privilege users, potentially leading to session hijacking, unauthorized actions, or data theft. It may also enable further compromise of the WordPress site.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's data protection requirements or HIPAA's security rules. It may result in non-compliance penalties, reputational damage, and loss of trust due to potential exposure of sensitive user data.

Mitigation Strategies

Update the Groundhogg plugin to version 4.5.13 or later immediately. Review and sanitize all form fields, especially dropdowns and radios, to ensure no malicious scripts are stored. Monitor administrative areas for unexpected script execution.

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