What it is
CVE-2022-50993 is an unauthenticated vulnerability affecting Weaver Network E-office. Weaver (Fanwei) E-office versions prior to 10.0_20221201 contain an unauthenticated arbitrary file upload vulnerability in the...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2022-50993
E-office Arbitrary File Access
Weaver Network / E-office · affected before 10.0_20221201
- Severity
- CVSS 9.3 · Critical
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 0.8%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.
Who is affected?
Weaver Network / E-office affected before 10.0_20221201.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
E-office Arbitrary File Access
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).
Vendor
Product
Affected
Status
Weaver Network Co., Ltd.
Affected
E-office
Before 10.0_20221201
Affected
- Published
- 30 Apr 2026
- Exploitation Reported
- 30 Apr 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2022-50993
- Patch — service.e-office.cn service.e-office.cn · Patch https://service.e-office.cn/knowledge/detail/5
- Third-Party Advisory — vulncheck.com vulncheck.com · Third-Party Advisory https://www.vulncheck.com/advisories/weaver-e-office-10-0-20221201-un...
- Exploit — cn-sec.com cn-sec.com · Exploit https://cn-sec.com/archives/1453025.html
- Exploit — bbs.chaitin.cn bbs.chaitin.cn · Exploit https://bbs.chaitin.cn/topic/37
Exploitation evidence
Why Previdian marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
The Shadowserver
A trusted third party reported exploitation.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-04-30 16:08 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- User-Agents
- Callback hosts
- 0
- 0
- 0
Request targets and User-Agents available in Pro. Callback host details available in Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v4.0
9.3
Critical
Potential damage if exploited. Separate from whether attackers are using it.
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
EPSS
0.8%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
All CVSS Scores
CVSS v4.0
9.3
Critical
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
CVSS v3.1
9.8
Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Timeline
From disclosure to observed exploitation
-
16:08 UTC
CVE published
Vulnerability disclosed publicly
-
16:08 UTC
Added to Previdian KEV Feed
High-confidence, third-party attested exploitation
-
18:22 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2022-50993
Free JSON includes basic KEV fields{
"cve_id": "CVE-2022-50993",
"confidence": "High",
"cvss_score": 9.3,
"cvss_estimated": false,
"epss_score": 0.00774,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}