CVE-2023-54398 Yonyou U8 Cloud Java Deserialization RCE via FileManageServlet
Unauthenticated attackers can execute arbitrary OS commands in Yonyou U8 Cloud via unsafe Java deserialization in FileManageServlet.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-54398?
CVE-2023-54398 is a critical unsafe deserialization vulnerability in Yonyou U8 Cloud, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2023-54398?
How do I fix CVE-2023-54398?
No fix has been published for CVE-2023-54398 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2023-54398 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-54398 exists.
Sources
Also known as GHSA-r89p-qrrf-vpmc.