CVE-2025-15228Network attack vector

Unauthenticated code execution via web shell upload

Published Dec 29, 2025 · Updated Dec 29, 2025

Arbitrary file upload in Welltend BPMFlowWebkit before 5.0.5 allows unauthenticated remote attackers to execute code via a web shell. The public advisory does not identify the upload endpoint or handler, but it establishes that the server accepts a dangerous file and makes the uploaded web shell executable. No account or user interaction is required; successful exploitation grants code execution in the server process context, with resulting read, write, and service-interruption impact.

CVSS severity9.3
Critical
EPSS probability0.58%
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 Welltend BPMFlowWebkit before 5.0.5 allows unauthenticated remote attackers to execute code via a web shell. The public advisory does not identify the upload endpoint or handler, but it establishes that the server accepts a dangerous file and makes the uploaded web shell executable. No account or user interaction is required; successful exploitation grants code execution in the server process context, with resulting read, write, and service-interruption impact.

The record

CVE
CVE-2025-15228
Published
Dec 29, 2025
Updated
Dec 29, 2025
Vendor
Welltend Technology Corporation
Product
BPMFlowWebkit
Classifications
CWE-434, CAPEC-650, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 29, 2025Record 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 <5.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Welltend Technology Corporation · BPMFlowWebkitversion=0 <5.0.5

Published CVSS scores

9.8TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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

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
T1505.003Web 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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