Unrestricted Upload Vulnerability in EyouCMS by Hainan Zanzan Network Technology Co., Ltd.
CVE-2026-6561

5.1MEDIUM

Key Information:

Vendor

Hainan Zanzan Network Technology Co., Ltd.

Status
Eyoucms
Vendor
CVE Published:
19 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6561?

A vulnerability within EyouCMS versions up to 1.7.1 allows attackers to perform unrestricted file uploads via the edit_adminlogo function in the application/admin/controller/Index.php file. This flaw results from improper handling of the 'filename' argument, enabling remote attackers to upload malicious files. The exploit has been publicly disclosed, raising concerns regarding the security of installations that have not been patched. Notably, the vendor has not responded to the disclosure, which further emphasizes the urgency for users to secure their systems.

Affected Version(s)

EyouCMS 1.7.0

EyouCMS 1.7.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-6561 - Proof of Concept

References

https://vuldb.com/vuln/358198
vdb-entrytechnical-description
https://vuldb.com/vuln/358198/cti
signaturepermissions-required
https://vuldb.com/submit/788038
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

z0ng (VulDB User)
VulDB CNA Team
.