CVE-2026-80233
Deferred Deferred - Pending Action

Arbitrary File Upload in CAYIN CMS Series

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: TWCERT/CC

Description
CAYIN CMS-WS, CMS-SE, and SMP series products developed by CAYIN Technology have an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shells backdoors, thereby enabling arbitrary code execution on the server.

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Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-09-15
AI Q&A
2026-08-26
EPSS Evaluated
2026-09-14
NVD
CVE-2026-80233
EUVD
EUVD-2026-66342

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
cayin_technology cayin_cms_ws *
cayin_technology cayin_cms_se *
cayin_technology cayin_smp_series *
cayin_technology cayin_cms_ws to 1.0.25336 (inc)
cayin_technology cayin_cms_se to 11.0.25336 (inc)
cayin_technology cayin_smp to 4.0.25336 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-434 The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

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Executive Summary

CAYIN CMS-WS, CMS-SE, and SMP series products have an Arbitrary File Upload vulnerability. Privileged remote attackers can upload and execute web shells or backdoors, allowing arbitrary code execution on the server.

Detection Guidance

Detecting this vulnerability requires checking for unauthorized file uploads or web shells in CAYIN CMS-WS, CMS-SE, or SMP installations. Inspect web directories for unexpected files, especially in upload folders. Review server logs for unusual POST requests to known vulnerable endpoints. Use network monitoring tools to detect outbound connections from the server to unknown IPs.

Impact Analysis

Attackers could gain control of affected servers, steal data, install malware, or disrupt services. This could lead to unauthorized access, data breaches, or system compromise.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face fines or legal consequences for non-compliance.

Mitigation Strategies

Immediately restrict network access to CAYIN CMS-WS, CMS-SE, and SMP series products to trusted users only. Disable unnecessary services and ports. Apply vendor patches or updates if available. Monitor for suspicious file uploads or web shell activity in web server directories.

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