Unauthenticated Arbitrary File Upload in Weaver E-office by Fanwei
CVE-2022-50993

9.3CRITICAL

Key Information:

Vendor

Weaver Network Co., Ltd.

Status
E-office
Vendor
CVE Published:
30 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2022-50993?

Weaver E-office versions before 10.0_20221201 are susceptible to an unauthenticated arbitrary file upload vulnerability in the OfficeServer.php endpoint. This flaw enables remote attackers to upload malicious files by leveraging multipart POST requests with arbitrary filenames and misleading content types. Attackers are capable of placing PHP webshells within the Document directory, facilitating remote code execution as the web server user. The first exploitation instances were noted by the Shadowserver Foundation on October 10, 2022.

Affected Version(s)

E-office 0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2022-50993 - Proof of Concept

CVE-2022-50993 - Proof of Concept

References

https://service.e-office.cn/knowledge/detail/5
release-notespatch
https://cn-sec.com/archives/1453025.html
technical-descriptionexploit
https://bbs.chaitin.cn/topic/37
technical-descriptionexploit

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

The Shadowserver Foundation
.