CVE-2023-6827Network attack vector

Authenticated arbitrary file upload via ajaxUploadFonts

Published Dec 15, 2023 · Updated Apr 8, 2026

Unrestricted file upload in G5Theme Essential Real Estate 4.3.5 and earlier allows remote authenticated users to write files to the server. The ajaxUploadFonts function accepts uploaded font files without adequately validating their types, allowing dangerous files into the site's upload path. Subscriber-level access is required; a successfully placed executable server-side file enables code execution under the web server account.

CVSS severity7.5
High
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in G5Theme Essential Real Estate 4.3.5 and earlier allows remote authenticated users to write files to the server. The ajaxUploadFonts function accepts uploaded font files without adequately validating their types, allowing dangerous files into the site's upload path. Subscriber-level access is required; a successfully placed executable server-side file enables code execution under the web server account.

The record

CVE
CVE-2023-6827
Published
Dec 15, 2023
Updated
Apr 8, 2026
Vendor
G5Theme
Product
Essential Real Estate
Classifications
CWE-434, CAPEC-1, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

G5Theme · Essential Real Estateversion=0 <=4.3.5

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5WordfenceCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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