Arbitrary file upload in Yonyou Network Technology Co., Ltd. Ksoa
CVE-2022-50973
Yonyou KSOA 9.0 contains an unauthenticated arbitrary file upload vulnerability in the com.sksoft.bill.ImageUpload servlet that allows unauthenticated attackers to upload arbitrary files by submitting a POST request with attacker-controlled filepath and filename parameters without any authentication, file type, extension, or content validation. Attackers can upload a JSP webshell by specifying a malicious filename and root filepath, with the uploaded file stored under the pictures directory and directly executed by the web server, resulting in unauthenticated remote code execution. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-11-07 (UTC).
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.015 (73.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000
Affected products
- Yonyou Network Technology Co., Ltd. Ksoa — versions 9.0
Weakness classification (CWE)
References
- buaq.net/go-167023.html (technical-description, exploit)
- cn-sec.com/archives/1329088.html (technical-description, exploit)
- www.cnblogs.com/yang-miemie/p/17714927.html (technical-description, exploit)
- www.vulncheck.com/advisories/yonyou-ksoa-unauthenticated-file-upload-rce-via-im… (third-party-advisory)
- www.yonyou.com/ (product)
Frequently asked questions
- What is CVE-2022-50973?
- CVE-2022-50973 is a critical-severity vulnerability in Yonyou Network Technology Co., Ltd. Ksoa, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-07-02.
- How severe is CVE-2022-50973?
- Critical severity. CVSS v3 base score is 9.8 out of 10.