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TI-2021-22767 Aliases CVE-2021-48016GHSA-8g3p-p68p-pg53

Code injection in DedeCMS lets unauthenticated attackers run PHP

Priority HIGH 81CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

DedeCMS through 5.8.1-beta contains a code injection flaw (CWE-94) where the HTTP Referer header is written into a template that is then included. An unauthenticated remote attacker can send a crafted Referer to execute arbitrary PHP and system commands. The Shadowserver Foundation first observed exploitation on 2023-10-14, and a public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00441 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
DedeCMSDedeCMSup to 5.8.1-beta—No fix listedCNA
  • DedeCMS VendorDedeCMS Affected up to 5.8.1-beta Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for DedeCMS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-22 Threatist record created from CVE-2021-48016
  2. 2026-10-22 Alias added: GHSA-8g3p-p68p-pg53
  3. 2026-10-29 CISA SSVC decision points changed
  4. 2026-10-29 Priority changed: MEDIUM → HIGH

References

Exploit 1

Other 2

  • TI-2026-23605 An issue in DedeCMS v.5.7.118 and before allows a remote attacker to execute arbitrary… CVSS 3.1CRITICAL 9.8
  • TI-2026-23594 An issue was discovered in DedeCMS 5.7.118 allowing attackers to execute code via crafted… CVSS 3.1CRITICAL 9.8
  • TI-2024-19496 DedeCMS v5.7 was discovered to contain a Cross-Site Request Forgery (CSRF) via the… CVSS 3.1CRITICAL 9.8
  • TI-2024-19491 A File Upload vulnerability in DedeCMS v5.7 allows a local attacker to execute arbitrary code via a crafted payload. CVSS 3.1CRITICAL 9.8
  • TI-2018-05549 DedeCMS 5.7 has CSRF with an impact of arbitrary code execution, because the partcode… CVSS 3.0HIGH 8.8
  • TI-2010-05075 File inclusion in DedeCMS via plus/carbuyaction.php CVSS 4.0HIGH 8.7
See all 167 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences