CVE-2026-81741: Groundhogg < 4.7.2 - Open Redirect via 'redirect_to' Parameter
The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before 4.7.2 does not restrict the redirect target of its email preference confirmation flow to the site's own host, allowing unauthenticated attackers to redirect visitors to an arbitrary external URL by way of a crafted link.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
groundhogg (WordPress plugin)to a version that resolves this vulnerability.Fixed in 4.7.2
Event History
Frequently Asked Questions
Who can exploit this issue, and what interaction is required?
No authentication is required. An attacker needs to persuade a visitor to follow a crafted link that reaches the email preference confirmation flow with a malicious redirect_to value.
Which deployments are affected?
Groundhogg versions before 4.7.2 are affected. The available information does not identify any configuration prerequisite or indicate that a non-default setup is required.
What is the immediate mitigation if upgrading is not possible?
The provided information does not specify a workaround. The affected behavior is the email preference confirmation flow accepting redirect_to targets outside the site host, so mitigation would need to prevent or constrain that behavior.