XSS in Groundhogg — Crm, Newsletters, And Marketing Automation

CVE-2026-81660

The Groundhogg — CRM, Newsletters, and Marketing Automation WordPress plugin before 4.5.13 does not validate or escape values submitted to some optional web form fields before storing them and outputting them back in an administrative area, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against high privilege users.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (41.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 41.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-81660: held from 0.003 to 0.005.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

  • Groundhogg — Crm, Newsletters, And Marketing Automation

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-81660?
CVE-2026-81660 is a high-severity vulnerability in Groundhogg — Crm, Newsletters, And Marketing Automation, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-08-30.
How severe is CVE-2026-81660?
High severity. CVSS v3 base score is 8.8 out of 10.