TI-2026-74597 Aliases CVE-2026-18548 GHSA-x57v-8jrr-596c

Stored cross-site scripting in Groundhogg WordPress plugin

LOW 37CWE-79Published 2026-10-15 · Updated 2026-10-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

The Groundhogg (CRM, Newsletters, and Marketing Automation) plugin for WordPress by trainingbusinesspros is affected in all versions up to and including 4.5.14. Insufficient input sanitization and output escaping of the ref parameter cause stored cross-site scripting (CWE-79). An unauthenticated attacker can inject arbitrary web scripts into pages that execute whenever a user opens an injected page.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00287 21st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
trainingbusinesspros	Groundhogg — CRM, Newsletters, and Marketing Automation	up to 4.5.14	—	No fix listed	CNA

Groundhogg — CRM, Newsletters, and Marketing Automation Vendortrainingbusinesspros Affected up to 4.5.14 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:groundhogg:groundhogg::::::::	—	—	trainingbusinesspros

cpe:2.3:a:groundhogg:groundhogg:*:*:*:*:*:*:*:* Versions — — ·trainingbusinesspros

Remediation

The sources list no fixed version for the Groundhogg (CRM, Newsletters, and Marketing Automation) plugin for WordPress.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-15 Threatist record created from CVE-2026-18548
2026-10-16 Alias added: GHSA-x57v-8jrr-596c
2026-10-16 CISA SSVC decision points changed
2026-10-16 Priority changed: MEDIUM → LOW

References

Other 3

TI-2023-01346 Groundhogg Contacts < 2.7.9.4 - Admin+ SQLi CVSS 3.1HIGH 7.2
TI-2023-01986 HollerBox < 2.1.4 - Admin+ SQL Injection CVSS 3.1MEDIUM 4.9
TI-2019-11742 The groundhogg plugin before 1.3.5 for WordPress has… CVSS 3.0HIGH 8.8
TI-2025-00313 Groundhogg <= 3.7.3.5 - Authenticated (Author+) Arbitrary File Upload via gh_big_file_upload Function CVSS 3.1HIGH 8.8
TI-2026-67410 Improper privilege management in trainingbusinesspros Groundhogg — CRM, Newsletters, and… CVSS 3.1HIGH 8.8
TI-2023-17022 WordPress Groundhogg Plugin <= 2.7.11 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8

See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences