Critical severity · published Oct 22, 2026
CVE-2021-48016
DedeCMS 5.8.1-beta Unauthenticated RCE via plus/flink.php
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DE
DedeCMS · DedeCMS
through 5.8.1-beta · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-48016
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-48016
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
srcincite.io
https://srcincite.io/blog/2021/09/30/chasing-a-dream-pwning-the-biggest-cms-in-china.html
www.vulncheck.com
https://www.vulncheck.com/advisories/dedecms-5.8.1-beta-unauthenticated-rce-via-plus-flink-php
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