Risk Letters

Exploited vulnerability

CVE-2021-48016

TLP:CLEAR

dedecms dedecms Improper Control of Generation of Code ('Code Injection')

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 2

Facts

  • Vendor: DedeCMS
  • Product: DedeCMS through
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 0.4 %
  • First known exploitation: 22 October 2026
  • First seen by Risk Letters: 22 October 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD