CVE-2026-2665Public exploitNetwork attack vector

Stored XSS via unchecked upload extension

Published Feb 18, 2026 · Updated Feb 18, 2026

Unrestricted upload in huanzi-qch Base Admin at 57a8126bb3353a004f3c7722089e3b926ea83596 allows remote authenticated users to store arbitrary files. The upload handler in SysFileController accepts the multipart file extension without validation, concatenates it with the filename, and saves the result. Low-privileged authenticated access to /baseadmin/sys/sysFile/upload is sufficient; uploaded HTML can execute stored scripts when visited, while JSP execution was not demonstrated.

CVSS severity6.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted upload in huanzi-qch Base Admin at 57a8126bb3353a004f3c7722089e3b926ea83596 allows remote authenticated users to store arbitrary files. The upload handler in SysFileController accepts the multipart file extension without validation, concatenates it with the filename, and saves the result. Low-privileged authenticated access to /baseadmin/sys/sysFile/upload is sufficient; uploaded HTML can execute stored scripts when visited, while JSP execution was not demonstrated.

The record

CVE
CVE-2026-2665
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
huanzi-qch
Product
Base Admin
Classifications
CWE-434, CWE-284, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=57a8126bb3353a004f3c7722089e3b926ea83596

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

huanzi-qch · Base Adminversion=57a8126bb3353a004f3c7722089e3b926ea83596

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS: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
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-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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