Critical 9.8Published Sep 15, 2026

CVE-2023-54398Yonyou U8 Cloud Java Deserialization RCE via FileManageServlet

Updated under an hour ago (2026-10-19 10:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for Yonyou U8 Cloud

Exploited in the last 30 days

Yonyou U8 Cloud contains an unauthenticated Java deserialization vulnerability in the nc.impl.pub.filesystem.FileManageServlet component that allows remote unauthenticated attackers to execute arbitrary OS commands by sending a serialized payload via POST request. Attackers can exploit the doAction method, which passes raw HTTP request body data directly to ObjectInputStream.readObject() without filtering, to achieve remote code execution. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-02-13.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Yonyou U8 Cloud yonyou:u8_cloud (from the name)	1.0; 2.0; 2.1; 2.3; 2.5; 2.6; 2.65; 2.7; and 6 more ranges	CNA record

References

https://security.yonyou.com/#/noticeInfo?id=400vendor-advisory, patch
https://cn-sec.com/archives/2182384.htmltechnical-description, exploit
https://blog.csdn.net/qq_41904294/article/details/134277353technical-description, exploit
https://avd.aliyun.com/detail?id=AVD-2023-1686894third-party-advisory
https://www.yonyou.com/Global/product
https://www.vulncheck.com/advisories/yonyou-u8-cloud-java-deserialization-rce-via-filemanageservletthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.