Unrestricted File Upload Vulnerability in WuzhiCMS by Wuzhi
CVE-2026-91849

5.3MEDIUM

Key Information:

Vendor

Wuzhi

Status
Wuzhicms
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91849?

A security flaw has been identified in WuzhiCMS versions up to 4.1.0, specifically in the Avatar Upload function member::setAvatar located in /index.php. This flaw enables attackers to manipulate the argument 'File', resulting in unrestricted upload capabilities. The vulnerability allows remote execution of the exploit, raising significant security concerns. Despite prior notification of the issue via an issue report, the vendor has yet to respond, leaving users susceptible to potential attacks.

Affected Version(s)

WuzhiCMS 4.0

WuzhiCMS 4.1.0

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-2026-91849 - Proof of Concept

References

https://vuldb.com/vuln/404077
vdb-entrytechnical-description
https://vuldb.com/vuln/404077/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-91849
third-party-advisory

CVSS V4

Score:
5.3
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

ZAST.AI (VulDB User)
VulDB CNA Team
.