What’s Vulnerable › Vulnerabilities

CVE-2026-80233: CAYIN Technology｜CAYIN CMS-WS/CMS-SE/SMP - Arbitrary File Upload

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-08-26
• Weakness: CWE-434

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.

Affected products

• CAYIN Technology CAYIN CMS-SE: through 11.0.25336
• CAYIN Technology CAYIN CMS-WS: through 1.0.25336
• CAYIN Technology CAYIN SMP: through 4.0.25336

References

• https://www.twcert.org.tw/en/cp-139-11135-189f7-2.html
• https://www.twcert.org.tw/tw/cp-132-11129-4a040-1.html

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