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High

Groundhogg <= 4.8.3 - Unauthenticated Privilege Escalation to Support User Identity Confusion

  • Disclosed: 09.10.2026
  • Updated: 11.10.2026 10:23

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.8.3 via the create_support_user() function. This is due to the function identifying the support account solely by matching against publicly hardcoded constants — user_login 'groundhogg' and email addresses 'support@groundhogg.io' / 'help@groundhogg.io' — where the in_array() email-equality check at line 238 is not a security boundary because any user fully controls their own email value. This makes it possible for an attacker with an account whose user_login is 'groundhogg' and whose user_email matches one of the hardcoded support constants to have that account silently promoted to administrator — and additionally to super admin on multisite when the triggering administrator holds manage_network_options — resulting in full site takeover. Exploitation requires a two-actor flow: the attacker must first obtain or pre-plant an account with the hardcoded credentials (possible when open user registration is enabled or another account-creation path exists), after which a legitimate administrator must invoke the support-access feature via the submit_ticket or process_send_support_access entry points to trigger the promotion.

Affected software

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PlatformPackageVulnerable versionsFixed in
WordPress plugin Groundhogg — CRM, Newsletters, and Marketing Automation <= 4.8.3 4.9

References

CVSS score 8.1/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-269
Platform
WordPress
Package
Groundhogg — CRM, Newsletters, and Marketing Automation
Disclosed
09.10.2026
Updated
11.10.2026 10:23

Sources and licenses

Wordfence Intelligence - c355658a-515a-48ed-a114-6a202e23e34b - Wordfence Intelligence

Copyright 1999-2026 The MITRE Corporation

Copyright 2012-2026 Defiant Inc.

This record contains material that is subject to copyright

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Copyright 2012-2026 Defiant Inc.

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Wordfence Intelligence
Wordfence Intelligence - Defiant, Inc.
Copyright Defiant, Inc. All rights reserved except as granted below.
License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026):

Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy.

Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/

Vulnerability history: Groundhogg — CRM, Newsletters, and Marketing Automation

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (41) in the archive
Total entries
41
First → latest
04.2019 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 15
  • Medium 26

Disclosures per year

Severity:
  1. Groundhogg <= 4.8.3 - Unauthenticated Privilege Escalation to Support User Identity Confusion this entry
    High · 8.1 CVE-2026-92975 <= 4.8.3 4.9
  2. Groundhogg <= 4.9 - Authenticated (Custom+) Privilege Escalation to 'user' Parameter
    High · 8.8 CVE-2026-104725 <= 4.9 4.9.1
  3. Groundhogg <= 4.9 - Authenticated (Sales Person+) Privilege Escalation via Contact Identity Rebinding leading to Administrator Account Takeover to 'user_id' Parameter (v3 /contacts) chained with v4 /emails/test
    High · 8.8 CVE-2026-97644 <= 4.9 4.9.1
  4. Groundhogg — CRM, Newsletters, and Marketing Automation < 4.5.13 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-81660 < 4.5.13 4.5.13
  5. Groundhogg — CRM, Newsletters, and Marketing Automation <= 4.4.1 - Authenticated (Sales Representative+) Arbitrary File Deletion
    High · 8.1 CVE-2026-57389 <= 4.4.1 4.5
  6. Groundhogg — CRM, Newsletters, and Marketing Automation <= 4.4 - Authenticated (Sales Representative+) Arbitrary File Deletion
    High · 8.1 CVE-2026-40727 <= 4.4 4.4.1
  7. Groundhogg <= 4.2.2 - Authenticated (Sales Representative+) PHP Object Injection
    High · 7.5 CVE-2025-54053 <= 4.2.2 4.2.2.1
  8. Groundhogg <= 4.2.1 - Authenticated (Sales Rep+) Arbitrary File Upload
    High · 8.8 CVE-2025-48300 <= 4.2.1 4.2.2
  9. WordPress CRM, Email & Marketing Automation for WordPress | Award Winner — Groundhogg <= 4.1.1.2 - Authenticated (Administrator+) Arbitrary File Deletion
    High · 7.2 CVE-2025-4206 <= 4.1.1.2 4.1.2
  10. Groundhogg <= 3.7.3.5 - Authenticated (Author+) Arbitrary File Upload via gh_big_file_upload Function
    High · 8.8 CVE-2025-0394 <= 3.7.3.5 3.7.3.6
  11. Groundhogg <= 2.7.11 - Authenticated (Administrator+) SQL Injection
    High · 7.2 CVE-2023-34179 <= 2.7.11 2.7.11.1
  12. Groundhogg <= 2.7.9.8 - Cross-Site Request Forgery to Privilege Escalation
    High · 7.5 CVE-2023-2736 <= 2.7.9.8 2.7.10
  13. Groundhogg <= 2.7.9.3 - Authenticated (Administrator)+ SQL Injection
    High · 7.2 CVE-2023-1425 <= 2.7.9.3 2.7.9.4
  14. Groundhogg <= 1.3.11.13 - SQL Injection
    High · 8.8 bc69ec54-b30f-402e-ad3b-24fd680ea72b <= 1.3.11.13 2.0.8
  15. WordPress CRM, Email & Marketing Automation for WordPress | Award Winner — Groundhogg < 1.3.5 - Remote Code Execution
    High · 8.8 CVE-2019-15647 < 1.3.5 1.3.5

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