CVE-2026-6518Network attack vector

Authenticated RCE via unchecked remote ZIP extraction

Published Apr 18, 2026 · Updated Apr 18, 2026

Arbitrary file upload in CMP – Coming Soon & Maintenance Plugin 4.1.16 and earlier allows remote authenticated users to execute PHP code. The cmp_theme_update_install AJAX action downloads a ZIP from a user-supplied URL without validating its content and extracts it into the web-accessible wp-content/plugins/cmp-premium-themes directory. A valid administrator nonce and administrator-level access are required; Editor access alone cannot reach the action, and successful extraction yields server-side code execution.

CVSS severity8.8
High
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in CMP – Coming Soon & Maintenance Plugin 4.1.16 and earlier allows remote authenticated users to execute PHP code. The cmp_theme_update_install AJAX action downloads a ZIP from a user-supplied URL without validating its content and extracts it into the web-accessible wp-content/plugins/cmp-premium-themes directory. A valid administrator nonce and administrator-level access are required; Editor access alone cannot reach the action, and successful extraction yields server-side code execution.

The record

CVE
CVE-2026-6518
Published
Apr 18, 2026
Updated
Apr 18, 2026
Vendor
NiteoThemes
Product
CMP – Coming Soon & Maintenance Plugin
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 18, 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 <=4.1.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

NiteoThemes · CMP – Coming Soon & Maintenance Pluginversion=0 <=4.1.16

Published CVSS scores

8.8WordfenceCVSS:3.1/AV:N/AC:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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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