CVE-2023-54398 Yonyou U8 Cloud - Remote Code Execution

Yonyou U8 Cloud contains an unauthenticated insecure deserialization vulnerability in nc.impl.pub.filesystem.FileManageServlet, letting remote attackers execute arbitrary OS commands via crafted serialized payloads, exploit requires no authentication.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
None known
Authentication
Not required
EPSS
0.64% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-502

Vendor fix

Update to the latest version of Yonyou U8 Cloud.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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