CVE-2026-6663Network attack vector

Unauthenticated code execution via update_agent file write

Published May 12, 2026 · Updated May 12, 2026

Missing authorization in GWD Conex 2.9 and earlier allows remote attackers to execute PHP code through standalone agent endpoints. The gwd-backup.php and gwd-logs.php handlers accept update_agent requests without authentication when no API key is configured and write supplied PHP into the agent file. Exploitation requires an unregistered installation, the default unset API key, and an environment where the agent file is writable and web-executable.

CVSS severity4.8
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in GWD Conex 2.9 and earlier allows remote attackers to execute PHP code through standalone agent endpoints. The gwd-backup.php and gwd-logs.php handlers accept update_agent requests without authentication when no API key is configured and write supplied PHP into the agent file. Exploitation requires an unregistered installation, the default unset API key, and an environment where the agent file is writable and web-executable.

The record

CVE
CVE-2026-6663
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Graphic Web Design, Inc.
Product
GWD Conex
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <=2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Graphic Web Design, Inc. · GWD Conexversion=0 <=2.9

Published CVSS scores

4.8WordfenceCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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