CVE-2026-81741: Groundhogg open redirect in email preference confirmation

CVE-2026-81741 · Severity: medium · CVSS 4.7 · Published 2026-09-09

Groundhogg is a WordPress plugin that provides CRM, email marketing, and marketing automation features. The plugin fails to validate redirect URLs in its email preference confirmation flow, allowing attackers to craft malicious links that redirect users to attacker-controlled websites. Unauthenticated users can be tricked into clicking links from the legitimate site that seamlessly redirect to phishing pages or malware sites, potentially compromising sensitive data or credentials.

Technologies: Groundhogg. Vendors: Groundhogg.

Quick answers

Is CVE-2026-81741 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-81741 being exploited in the wild.
How severe is CVE-2026-81741?
Medium severity, with a CVSS score of 4.7, published 9 September 2026.
Which products and versions are affected?
Groundhogg before 4.7.2.
Is there a fix for CVE-2026-81741?
A patch was published on 2026-09-09: Fixed in version 4.7.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-81741 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-81741?
Check whether you run Groundhogg 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 vulnerability is an open redirect (CWE-601) in the email preference confirmation flow. The plugin does not restrict the redirect_to parameter to the site's own host, allowing unauthenticated attackers to specify arbitrary external URLs. The attack requires either a valid contact record on the site (obtained by subscribing through any opt-in form) or relies on a logged-in WordPress user with a Groundhogg contact record. Attackers craft a malicious link using legitimate pk and gi parameters along with an attacker-controlled redirect_to value, causing a 302 redirect to the specified external domain. The vulnerability was fixed in version 4.7.2.

Affected products

  • Groundhogg Groundhogg before 4.7.2

Timeline

  • 2026-09-07: disclosed
  • 2026-09-09: patched: Fixed in version 4.7.2

References

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