Weaver E-office < 10.0_20221201 Unauthenticated Arbitrary File Read via XmlRpcServlet

published 2026-04-30 6 mo ago modified 2026-07-15 3 mo ago also EUVD-2022-55965

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

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).

Patch / fix

fixed in 1 links 1

Weaver Network Co., Ltd. E-office 10.0_20221201

service.e-office.cn/knowledge/detail/5 patch

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 6 mo ago (2026-04-30)

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

cn-sec.com https://cn-sec.com/archives/1453025.html referenced PoC, tagged "exploit" by a source, unverified
bbs.chaitin.cn https://bbs.chaitin.cn/topic/37 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Weaver Network Co., Ltd. E-office

Classification

Weakness

CWE-434 Unrestricted Upload of File with Dangerous Type

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
vulncheck.com /advisories/weaver-e-office-10-0-20221201-unauthenticated-arbitrary-file-read-via-xmlrpcservlet
third-party-advisory

Sources

CVE List CVE-2022-50993
NVD CVE-2022-50993

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary