CVE-2026-5261Public exploitNetwork attack vector

Unauthenticated arbitrary file upload via uploadFileToIIS

Published Apr 1, 2026 · Updated Apr 1, 2026

Unrestricted file upload in Shandong Hoteam InforCenter PLM 8.3.0 through 8.3.8 allows remote attackers to upload arbitrary files. The uploadFileToIIS function in /Base/BaseHandler.ashx accepts the File argument without restricting dangerous file types. No authentication or user interaction is required, and uploaded server-executable content can provide remote code execution.

CVSS severity7.3
High
EPSS probability0.39%
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 Shandong Hoteam InforCenter PLM 8.3.0 through 8.3.8 allows remote attackers to upload arbitrary files. The uploadFileToIIS function in /Base/BaseHandler.ashx accepts the File argument without restricting dangerous file types. No authentication or user interaction is required, and uploaded server-executable content can provide remote code execution.

The record

CVE
CVE-2026-5261
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
Shandong Hoteam Software Co., Ltd.
Product
InforCenter PLM
Classifications
CWE-434, CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 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=8.3.0
  2. Affected versionversion=8.3.1
  3. Affected versionversion=8.3.2
  4. Affected versionversion=8.3.3
  5. Affected versionversion=8.3.4
  6. Affected versionversion=8.3.5
  7. Affected versionversion=8.3.6
  8. Affected versionversion=8.3.7
  9. Affected versionversion=8.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shandong Hoteam Software Co., Ltd. · InforCenter PLMversion=8.3.0; version=8.3.1; version=8.3.2; version=8.3.3; version=8.3.4; version=8.3.5; version=8.3.6; version=8.3.7; version=8.3.8

Published CVSS scores

7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

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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