CVE-2026-88419Network attack vector

Authenticated code execution via unchecked thumbnail extension

Published Sep 22, 2026 · Updated Sep 22, 2026

Unrestricted file upload in WuzhiCMS 5.0.0 allows remote authenticated users to execute arbitrary PHP code through a crafted thumbnail. The thumbnail-upload endpoint preserves the client-supplied .php extension without an allowlist or content check and writes the file under uploadfile/. A low-privileged member account and PHP execution in that web-accessible directory are required; successful exploitation runs code with the web server process privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.48%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in WuzhiCMS 5.0.0 allows remote authenticated users to execute arbitrary PHP code through a crafted thumbnail. The thumbnail-upload endpoint preserves the client-supplied .php extension without an allowlist or content check and writes the file under uploadfile/. A low-privileged member account and PHP execution in that web-accessible directory are required; successful exploitation runs code with the web server process privileges.

The record

CVE
CVE-2026-88419
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1505.003Web Shell

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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