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Vulnerabilities

Vulnerability · CVE-2026-18548

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

Published Oct 15, 2026 · catalog updated Oct 15, 2026 · Groundhogg — CRM, Newsletters, and Marketing Automation

Check if you run it

No confirmed exploitation is on record for CVE-2026-18548. EPSS is 0.29%. Act only if a listed version of Groundhogg — CRM, Newsletters, and Marketing Automation is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Version ranges on file
Affected products
stated Groundhogg — CRM, Newsletters, and Marketing Automation · vendor trainingbusinesspros Groundhogg — CRM, Newsletters, and Marketing Automation

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Groundhogg — CRM, Newsletters, and Marketing Automation<= 4.5.14
  • vendor trainingbusinesspros Groundhogg — CRM, Newsletters, and Marketing Automationversion unspecified

How to fix CVE-2026-18548

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-18548. EPSS is 0.29%. Act only if a listed version of Groundhogg — CRM, Newsletters, and Marketing Automation is installed.

Which versions are affected?

Compare what you have installed with Groundhogg — CRM, Newsletters, and Marketing Automation <= 4.5.14. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · NIST NVD

    Detected

    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 injec

  2. Oct 15, 2026 · NIST NVD

    Updated

    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 injec

  3. Oct 15, 2026 · NIST NVD

    Updated

    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 injec

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-18548

    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 fo

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-18548

    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 fo

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-18548

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-18548

    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 fo

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.