NVD CRITICAL: CVE-2021-48016 — DedeCMS through 5.8.1-beta contains a PHP code injection vulnerability in ShowMs...

Thursday, October 22, 2026 at 11:17 AM UTC·Source: NIST NVD

Updated: Saturday, October 24, 2026 at 12:01 AM UTC

Executive Summary

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

Analysis

Indicators of Compromise (1)

CVE (1)

CVE-2021-48016

NVD MITRE CVE

Source Attribution

Originally published by NIST NVD on Oct 22, 2026. Verified by: NIST.

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