PHP Code Injection Vulnerability in DedeCMS by DedeCMS Team
CVE-2021-48016

9.3CRITICAL

Key Information:

Vendor

Dedecms

Status
Dedecms
Vendor
CVE Published:
22 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-48016?

DedeCMS versions up to 5.8.1-beta are susceptible to a PHP code injection vulnerability found in the ShowMsg() function. This vulnerability allows unauthenticated attackers to exploit the system by sending a malicious HTTP Referer header to the endpoint /plus/flink.php?dopost=save with an empty validation code. This can lead to unauthorized execution of arbitrary PHP code and system commands, compromising the integrity and security of the web application. The potential impact is serious, as it exposes systems to exploitation by remote attackers.

Affected Version(s)

DedeCMS 0 <= 5.8.1-beta

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-2021-48016 - Proof of Concept

References

https://srcincite.io/blog/2021/09/30/chasing-a-dream-pwni...
technical-descriptionexploit
https://github.com/dedecms/DedeCMS/blob/v5.8.1/include/co...
technical-description
https://github.com/projectdiscovery/nuclei-templates/blob...
technical-description

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
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

The Shadowserver Foundation
.