CVE-2026-80235Network attack vector

Unauthenticated code execution via web shell upload

Published Aug 26, 2026 · Updated Aug 26, 2026

Unrestricted file upload in Thinking Software Technology EFence 1.2.66 DB Ver:56 and earlier allows remote attackers to execute code. The server-side upload functionality accepts a web-shell backdoor and makes it executable, but TWCERT has not identified the handler or missing validation check. No credentials or user interaction are required, and successful exploitation grants control over server-side code execution.

CVSS severity9.8
Critical
EPSS probability0.68%
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 Thinking Software Technology EFence 1.2.66 DB Ver:56 and earlier allows remote attackers to execute code. The server-side upload functionality accepts a web-shell backdoor and makes it executable, but TWCERT has not identified the handler or missing validation check. No credentials or user interaction are required, and successful exploitation grants control over server-side code execution.

The record

CVE
CVE-2026-80235
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Thinking Software Technology Co., Ltd.
Product
EFence
Classifications
CWE-434, CAPEC-650, T1505.003, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.2.66 DB Ver:56

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Thinking Software Technology Co., Ltd. · EFenceversion=0 <=1.2.66 DB Ver:56

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1505.003Server Software Component: Web Shell
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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