Arbitrary file upload in Weaver Network Co., Ltd. E-Office
CVE-2022-50993
Weaver (Fanwei) E-office versions prior to 10.0_20221201 contain an unauthenticated arbitrary file upload vulnerability in the OfficeServer.php endpoint that allows remote attackers to upload malicious files by sending multipart POST requests with arbitrary filenames and disguised content types. Attackers can upload PHP webshells to the Document directory and execute them via HTTP GET requests to achieve remote code execution as the web server user. Exploitation evidence was first observed by the Shadowserver Foundation on 2022-10-10 (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: 0.008 (54.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Weaver Network Co., Ltd. E-Office — versions 0
Weakness classification (CWE)
References
- service.e-office.cn/knowledge/detail/5 (release-notes, patch)
- cn-sec.com/archives/1453025.html (technical-description, exploit)
- bbs.chaitin.cn/topic/37 (technical-description, exploit)
- www.vulncheck.com/advisories/weaver-e-office-10-0-20221201-unauthenticated-arbi… (third-party-advisory)
Frequently asked questions
- What is CVE-2022-50993?
- CVE-2022-50993 is a critical-severity vulnerability in Weaver Network Co., Ltd. E-Office, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-04-30.
- How severe is CVE-2022-50993?
- Critical severity. CVSS v3 base score is 9.8 out of 10.