Is CVE-2023-2523 actively exploited?

Yes. KEV Intelligence tracks CVE-2023-2523 as a known exploited vulnerability. Confidence is high.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2023-2523. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2023-2523 affects Weaver E-Office. Reported affected version: 9.5.

No. CVE-2023-2523 is not currently listed in CISA KEV.

Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2023-2523

Weaver E-Office unrestricted upload

Weaver / E-Office · 9.5

View live feed Monitor via API Watch CVE

Severity: CVSS 7.3 · High
Confidence: High
Exploit status: Exploited in the wild
EPSS: 32.9%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-2523 is an unauthenticated Weaver E-Office unrestricted upload. A vulnerability was found in Weaver E-Office 9.5. It has been rated as critical. Affected by this issue is some unknown functionality of the...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.

Who is affected?

Weaver / E-Office 9.5.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

A vulnerability was found in Weaver E-Office 9.5

A vulnerability was found in Weaver E-Office 9.5. It has been rated as critical. Affected by this issue is some unknown functionality of the file App/Ajax/ajax.php?action=mobile_upload_save. The manipulation of the argument upload_quwan leads to unrestricted upload. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-228014 is the identifier assigned to this vulnerability.

NOTE: The vendor was contacted early about this disclosure but did not respond in any way. Eine kritische Schwachstelle wurde in Weaver E-Office 9.5 ausgemacht. Hierbei geht es um eine nicht exakt ausgemachte Funktion der Datei App/Ajax/ajax.php?action=mobile_upload_save. Mittels Manipulieren des Arguments upload_quwan mit unbekannten Daten kann eine unrestricted upload-Schwachstelle ausgenutzt werden. Umgesetzt werden kann der Angriff über das Netzwerk. Der Exploit steht zur öffentlichen Verfügung.

Vendor Product Affected Status

Weaver E-Office 9.5 Affected

Published: 04 May 2023
Exploitation Reported: 04 May 2023
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-2023-2523
GitHub — RCEraser/cve github.com · Exploit https://github.com/RCEraser/cve/blob/main/Weaver.md
Technical Description — vuldb.com vuldb.com · Technical Description https://vuldb.com/?id.228014
Signature — vuldb.com vuldb.com · Signature https://vuldb.com/?ctiid.228014

Exploitation evidence

Why KEV Intelligence 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

Recorded 04 May 2023

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
The Shadowserver First	2023-05-04 18:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence 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 v3.1

7.3 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS

32.9%

Weaknesses

Unrestricted Upload of File with Dangerous Type CWE-434

All CVSS Scores

CVSS v3.1 7.3 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.0 7.3 High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v2.0 7.5 High

AV:N/AC:L/Au:N/C:P/I:P/A:P

Timeline

From disclosure to observed exploitation

04 May 2023
CVE published

Vulnerability disclosed publicly
04 May 2023
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
04 May 2023
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.

View Pro pricing Read API docs

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-2023-2523

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2023-2523",
  "confidence": "High",
  "cvss_score": 7.3,
  "cvss_estimated": false,
  "epss_score": 0.32895,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

Get alerts on high-impact exploitation

Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.