CVE-2026-80237Network attack vector

Authenticated code execution via web-shell upload

Published Aug 26, 2026 · Updated Aug 26, 2026

Arbitrary file upload in Thinking Software Technology EFence 1.2.66 DB Ver:56 and earlier allows remote authenticated users to execute server code. The affected upload path accepts a web-shell file and leaves it executable by the web server; TWCERT has not disclosed the endpoint or failed validation check. A valid account is required, and successful exploitation runs attacker-supplied code with the server process's access to data and services.

CVSS severity8.8
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Thinking Software Technology EFence 1.2.66 DB Ver:56 and earlier allows remote authenticated users to execute server code. The affected upload path accepts a web-shell file and leaves it executable by the web server; TWCERT has not disclosed the endpoint or failed validation check. A valid account is required, and successful exploitation runs attacker-supplied code with the server process's access to data and services.

The record

CVE
CVE-2026-80237
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
Thinking Software Technology Co., Ltd.
Product
EFence
Classifications
CWE-434, CAPEC-650, T1505.003
Attack vector
network
Privileges
authenticated

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 privilegesauthenticated

What is affected?

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

Published CVSS scores

8.7TWCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
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

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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