CVE-2023-54398 — Yonyou U8 Cloud contains an unauthenticated Java deserialization vulnerability i

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 e

01What is this vulnerability?

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…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-09-15T17:17:08.343
• Last modified: 2026-09-24T20:43:32.537

09References

• avd.aliyun.com — https://avd.aliyun.com/detail?id=AVD-2023-1686894
• blog.csdn.net — https://blog.csdn.net/qq_41904294/article/details/134277353
• cn-sec.com — https://cn-sec.com/archives/2182384.html
• security.yonyou.com — https://security.yonyou.com/#/noticeInfo?id=400
• www.vulncheck.com — https://www.vulncheck.com/advisories/yonyou-u8-cloud-java-deserialization-rce-vi…
• www.yonyou.com — https://www.yonyou.com/Global/