CVE-2025-56263Public exploitNetwork attack vector

Authenticated arbitrary file storage via unchecked extension

Published Sep 16, 2025 · Updated Sep 16, 2025

Unrestricted file upload in by-night sms 1.0 allows remote authenticated users to store arbitrary files through the avatar upload API. The upload method in com.zjh.sms.controller.Upload trusts the supplied filename extension and enforces file-type checks only in the frontend. A low-privileged account and network access are required; the proof of concept demonstrates storage of an executable-named file, not its execution.

CVSS severity8.8
High
EPSS probability0.40%
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 by-night sms 1.0 allows remote authenticated users to store arbitrary files through the avatar upload API. The upload method in com.zjh.sms.controller.Upload trusts the supplied filename extension and enforces file-type checks only in the frontend. A low-privileged account and network access are required; the proof of concept demonstrates storage of an executable-named file, not its execution.

The record

CVE
CVE-2025-56263
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, CAPEC-1, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1105Ingress Tool Transfer

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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