---
id: CVE-2023-54398
title: >-
  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
  serialize…
summary: >-
  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
  serialize…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
vendor: Yonyou
product: U8 Cloud
affected:
  - u8_cloud 1.0
  - u8_cloud 2.0
  - u8_cloud 2.1
  - u8_cloud 2.3
  - u8_cloud 2.5
  - u8_cloud 2.6
  - u8_cloud 2.65
  - u8_cloud 2.7
  - u8_cloud 3.0
  - u8_cloud 3.1
  - u8_cloud 3.2
  - u8_cloud 3.5
  - u8_cloud 3.6
  - u8_cloud 3.6sp
published: '2026-09-15'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:43:32.537'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-54398'
references:
  - url: 'https://avd.aliyun.com/detail?id=AVD-2023-1686894'
    label: disclosure@vulncheck.com
  - url: 'https://blog.csdn.net/qq_41904294/article/details/134277353'
    label: disclosure@vulncheck.com
  - url: 'https://cn-sec.com/archives/2182384.html'
    label: disclosure@vulncheck.com
  - url: 'https://security.yonyou.com/#/noticeInfo?id=400'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yonyou-u8-cloud-java-deserialization-rce-via-filemanageservlet
    label: disclosure@vulncheck.com
  - url: 'https://www.yonyou.com/Global/'
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00642
epssPercentile: 0.48603
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-15T17:30:16.079872Z'
ingestedAt: '2026-09-15T17:41:02.858Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.