CVE-2025-8841Public exploitNetwork attack vector

Stored script injection via unrestricted file upload

Published Aug 11, 2025 · Updated Aug 11, 2025

Unrestricted file upload in zlt2000 microservices-platform 6.0.0 and earlier allows remote authenticated users to store dangerous files in S3. FileController.files-anon passes a multipart file to AbstractIFileService, which accepts any suffix and sends its supplied content type and object directly to S3 without type validation. Low-privileged network access is sufficient to publish attacker-controlled HTML or PDF content at the returned object URL, enabling stored script or phishing content.

CVSS severity6.1
Medium
EPSS probability0.30%
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 zlt2000 microservices-platform 6.0.0 and earlier allows remote authenticated users to store dangerous files in S3. FileController.files-anon passes a multipart file to AbstractIFileService, which accepts any suffix and sends its supplied content type and object directly to S3 without type validation. Low-privileged network access is sufficient to publish attacker-controlled HTML or PDF content at the returned object URL, enabling stored script or phishing content.

The record

CVE
CVE-2025-8841
Published
Aug 11, 2025
Updated
Aug 11, 2025
Vendor
zlt2000
Product
microservices-platform
Classifications
CWE-284, CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 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=6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

zlt2000 · microservices-platformversion=6.0

Published CVSS scores

5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

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

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-434Unrestricted Upload of File with Dangerous Type
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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