Unrestricted Upload Vulnerability in DeDeCMS 3 by DeDeCMS
CVE-2026-76800

5.3MEDIUM

Key Information:

Vendor

DeDeCMS

Status
Dedecms
Vendor
CVE Published:
20 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-76800?

A vulnerability exists in DeDeCMS 3 that allows an attacker to manipulate the 'uploadfile' argument within the /include/dialog/select_media_post.php file. This flaw can result in unrestricted file uploads, which can be exploited remotely. The availability of this exploit has been documented, raising significant concerns for users of the platform as it poses risks of unauthorized access and control over affected systems.

Affected Version(s)

DeDeCMS 3

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-2026-76800 - Proof of Concept

References

https://vuldb.com/vuln/393317
vdb-entrytechnical-description
https://vuldb.com/vuln/393317/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-76800
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

huliangjia (VulDB User)
.