CVE-2026-1331Network attack vector

Unauthenticated code execution via web-shell upload

Published Jan 22, 2026 · Updated Jan 22, 2026

Unrestricted file upload in MeetingHub with the attendance module installed allows remote attackers to execute server-side code via a web shell. The attendance module accepts an unauthenticated file upload and permits the uploaded file to run as server-side content, but no endpoint or validation defect is public. Exposure requires the attendance module, and successful exploitation grants code execution in the MeetingHub server's security context.

CVSS severity9.3
Critical
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in MeetingHub with the attendance module installed allows remote attackers to execute server-side code via a web shell. The attendance module accepts an unauthenticated file upload and permits the uploaded file to run as server-side content, but no endpoint or validation defect is public. Exposure requires the attendance module, and successful exploitation grants code execution in the MeetingHub server's security context.

The record

CVE
CVE-2026-1331
Published
Jan 22, 2026
Updated
Jan 22, 2026
Vendor
HAMASTAR Technology Co., Ltd.
Product
MeetingHub
Classifications
CWE-434, CAPEC-650, T1505.003, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HAMASTAR Technology Co., Ltd. · MeetingHubversion=0

Published CVSS scores

9.3TWCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-650Upload a Web Shell to a Web Server
T1505.003Web Shell
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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