CVE-2021-48016

CRITICAL 9.8

DedeCMS 5.8.1-beta Unauthenticated RCE via plus/flink.php

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

DedeCMS through 5.8.1-beta contains a PHP code injection vulnerability in ShowMsg() where the HTTP Referer header is written into a DedeTemplate string and included. Unauthenticated attackers can send a crafted Referer to /plus/flink.php?dopost=save with an empty validate code to execute arbitrary PHP and system commands. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-14.

CWE	CWE-94
Vendor	dedecms
Product	dedecms
Published	Oct 22, 2026

Stay Ahead of the Next One

Get instant alerts for dedecms dedecms

Be the first to know when new critical vulnerabilities affecting dedecms dedecms are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

DedeCMS / DedeCMS

0 ≤ 5.8.1-beta

References

NVD ↗ CVE.org ↗ EPSS Data ↗

srcincite.io: https://srcincite.io/blog/2021/09/30/chasing-a-dream-pwning-the-biggest-cms-in-china.html github.com: https://github.com/dedecms/DedeCMS/blob/v5.8.1/include/common.func.php github.com: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/dedecms/dedecms-rce.yaml vulncheck.com: https://www.vulncheck.com/advisories/dedecms-5.8.1-beta-unauthenticated-rce-via-plus-flink-php

Credits

🔍 The Shadowserver Foundation