CVE-2025-66571Public exploitNetwork attack vector

Unauthenticated code execution via serialized profile ID

Published Dec 4, 2025 · Updated Jul 28, 2026

PHP object injection in UNA CMS 9.0.0-RC1 through 14.0.0-RC4 allows remote attackers to execute arbitrary PHP code without authentication. The BxBaseMenuSetAclLevel::getCode() method URL-decodes a nonnumeric profile_id POST value and passes it directly to PHP unserialize(). A crafted AJAX request to menu.php can instantiate a Guzzle file-cookie gadget that writes a PHP web shell, enabling command execution as the web service account.

CVSS severity9.3
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in UNA CMS 9.0.0-RC1 through 14.0.0-RC4 allows remote attackers to execute arbitrary PHP code without authentication. The BxBaseMenuSetAclLevel::getCode() method URL-decodes a nonnumeric profile_id POST value and passes it directly to PHP unserialize(). A crafted AJAX request to menu.php can instantiate a Guzzle file-cookie gadget that writes a PHP web shell, enabling command execution as the web service account.

The record

CVE
CVE-2025-66571
Published
Dec 4, 2025
Updated
Jul 28, 2026
Vendor
UNA, Inc.
Product
UNA CMS
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=9.0.0-RC1 <=14.0.0-RC4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

UNA, Inc. · UNA CMSversion=9.0.0-RC1 <=14.0.0-RC4

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

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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