CVE-2026-18548 Groundhogg CRM, Newsletters, and Marketing Automation - Stored XSS

Groundhogg CRM, Newsletters, and Marketing Automation plugin for WordPress <= 4.5.14 contains a stored cross-site scripting caused by insufficient input sanitization and output escaping in the 'ref' parameter, letting unauthenticated attackers execute arbitrary scripts when users access injected pages.

CVSS base score 7.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Stored XSS
Impact
Stored XSS
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published
15 October 2026
Updated
15 October 2026
Weakness
CWE-79

Vendor fix

Update to a version later than 4.5.14 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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