CVE-2023-6827: Essential Real Estate <= 4.3.5 - Authenticated (Subscriber+) Arbitrary File Upload

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-15 · updated 2026-06-17
Weakness: CWE-434

Description

The Essential Real Estate plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation on the 'ajaxUploadFonts' function in versions up to, and including, 4.3.5. This makes it possible for authenticated attackers with subscriber-level capabilities or above, to upload arbitrary files on the affected site's server which may make remote code execution possible. CVE-2023-6140 appears to be a duplicate of this issue.

Affected products

g5theme Essential Real Estate: through 4.3.5

References

https://plugins.trac.wordpress.org/browser/essential-real-estate/tags/4.3.5/lib/smart-framework/core/fonts/fonts.class.php#L524
https://plugins.trac.wordpress.org/changeset/3009780/essential-real-estate
https://www.wordfence.com/threat-intel/vulnerabilities/id/8bb2ce22-077b-41dd-a2ff-cc1db9d20d38?source=cve
https://plugins.trac.wordpress.org/browser/essential-real-estate/tags/4.3.5/lib/smart-framework/core/fonts/fonts.class.php#L524
https://plugins.trac.wordpress.org/changeset/3009780/essential-real-estate
https://www.wordfence.com/threat-intel/vulnerabilities/id/8bb2ce22-077b-41dd-a2ff-cc1db9d20d38?source=cve

Get alerted when CVE-2023-6827 or the next vulnerability affects your stack