CVE-2026-18387 json
Groundhogg <= 4.5.14 - Authenticated (Vendor+) SQL Injection via 'tag_query' Parameter
published 2026-08-15 2 mo ago modified 2026-08-20 2 mo ago also EUVD-2026-58855
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to generic SQL Injection via the 'tag_query' parameter in all versions up to, and including, 4.5.14 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with vendor-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. Exploitation requires the attacker to trigger the vulnerable Legacy_Contact_Query code path by submitting an unknown filter type (e.g. filters[0][0][type]=force_fallback), which causes a FilterException that dispatches execution away from the modern query handler.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- trainingbusinesspros Groundhogg — CRM, Newsletters, and Marketing Automation
Classification
- Weakness
-
- CWE-89 Improper Neutralization of Special Elements used in an SQL Command
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/04881aac-9d3b-48c0-b095-e91797df46e3?source=cve
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.14/includes/tag-query.php#L415
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.14/includes/tag-query.php#L393
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.14/includes/legacy-contact-query.php#L548
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.14/includes/contact-query.php#L2599
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.14/api/v4/contacts-api.php#L230
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.6/includes/tag-query.php#L415
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.6/includes/tag-query.php#L393
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.6/includes/legacy-contact-query.php#L548
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.6/includes/contact-query.php#L2599
- plugins.trac.wordpress.org /browser/groundhogg/tags/4.5.6/api/v4/contacts-api.php#L230
- plugins.trac.wordpress.org /changeset?reponame=&old=3643654%40groundhogg&new=3643654%40groundhogg
Sources
- CVE List CVE-2026-18387
- NVD CVE-2026-18387
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.