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CVE-2016-20052 Snewscms CVE debrief

CVE-2016-20052 is a critical vulnerability in Snews CMS 1.7 that allows unauthenticated attackers to upload arbitrary files, including PHP executables, to the snews_files directory. This can be achieved through the multipart form-data upload endpoint, enabling remote code execution by accessing the uploaded file path. The vulnerability has a CVSS score of 9.3, indicating a critical severity level. Administrators and users of Snews CMS 1.7 should be aware of this vulnerability and take immediate action to prevent exploitation. The vulnerability is caused by an unrestricted file upload feature in Snews CMS 1.7.

Vendor
Snewscms
Product
Snews CMS upload sheller
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-04
Original CVE updated
2026-07-21
Advisory published
2026-04-04
Advisory updated
2026-07-21

Who should care

Administrators and users of Snews CMS 1.7 should be aware of this vulnerability and take immediate action to prevent exploitation. The vulnerability has a CVSS score of 9.3, indicating a critical severity level. Operators, platform administrators, and security teams should review the vulnerability and implement necessary mitigations.

Technical summary

The vulnerability is caused by an unrestricted file upload feature in Snews CMS 1.7. Attackers can upload malicious PHP files through the multipart form-data upload endpoint and execute them by accessing the uploaded file path, achieving remote code execution. The CVSS score for this vulnerability is 9.3, indicating a critical severity level. The vulnerability affects Snews CMS 1.7, and administrators and users should take immediate action to prevent exploitation.

Defensive priority

High priority should be given to patching or mitigating this vulnerability to prevent potential attacks.

Recommended defensive actions

  • Apply the latest patch or update to Snews CMS 1.7
  • Restrict access to the multipart form-data upload endpoint
  • Monitor the snews_files directory for suspicious file uploads
  • Implement additional security measures such as web application firewalls and intrusion detection systems
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-04T14:16:17.520Z and was last modified on 2026-07-21T07:10:00.117Z. The NVD entry is currently Analyzed. The vulnerability is caused by an unrestricted file upload feature in Snews CMS 1.7. Attackers can upload malicious PHP files through the multipart form-data upload endpoint and execute them by accessing the uploaded file path, achieving remote code execution. The CVSS score for this vulnerability is 9.3, indicating a critical severity level. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-04T14:16:17.520Z and has not been modified since then. The NVD entry is currently Analyzed.