CVE-2023-54398

Yonyou U8 Cloud Java Deserialization RCE via FileManageServlet

State: Published
Severity: 9.3 Critical
Published: Sep 15, 2026
Updated: Sep 15, 2026
Reserved: Sep 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
U8 CloudYonyou	1.0Affected 2.0Affected 2.1Affected 2.3Affected 2.5Affected 2.6Affected 2.65Affected 2.7Affected 3.0Affected 3.1Affected 3.2Affected 3.5Affected 3.6Affected 3.6spAffected

References

Vendor Advisoryvendor-advisorypatch
CN-SEC Blogtechnical-descriptionexploit
CSDN Blogtechnical-descriptionexploit
AVD Advisorythird-party-advisory
Vendor Homepageproduct
https://www.vulncheck.com/advisories/yonyou-u8-cloud-java-deserialization-rce-via-filemanageservletthird-party-advisory

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