CVE-2026-18548

Groundhogg <= 4.5.14 - Unauthenticated Stored Cross-Site Scripting via 'ref' Parameter

7.2 High

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'ref' parameter in all versions up to, and including, 4.5.14 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.29%Unchanged since Oct 15, 2026

What each source reports

CVE List Score used 7.2

Groundhogg <= 4.5.14 - Unauthenticated Stored Cross-Site Scripting via 'ref' Parameter

Record: CVE-2026-18548
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-101843 7.2

Record: EUVD-2026-101843
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-x57v-8jrr-596c 7.2

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to...

Record: GHSA-x57v-8jrr-596c
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

NVD 7.2

Record: CVE-2026-18548
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 7.2

Groundhogg <= 4.5.14 - Unauthenticated Stored Cross-Site Scripting via 'ref' Parameter

Record: CVE-2026-18548
CVSS 3.1: 7.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

trainingbusinesspros groundhogg — crm, newsletters, and marketing automation

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-18548 is a high vulnerability (CVSS 7.2) in Trainingbusinesspros Groundhogg — Crm, Newsletters, And Marketing Automation, published October 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. No source names a fixed version.