CVE-2023-5490Public exploitNetwork attack vector

Authenticated server privilege gain via unrestricted PHP upload

Published Oct 10, 2023 · Updated Aug 2, 2024

Unrestricted file upload in Byzoro Smart S45F 20230928 allows remote authenticated users to place executable PHP files through web_img. The userattestation.php handler accepts a multipart web_img part named with a .php extension and makes it reachable beneath /upload. A valid management session is required; executing the uploaded file grants server privileges and can disrupt gateway operations.

CVSS severity8.8
High
EPSS probability1.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unrestricted file upload in Byzoro Smart S45F 20230928 allows remote authenticated users to place executable PHP files through web_img. The userattestation.php handler accepts a multipart web_img part named with a .php extension and makes it reachable beneath /upload. A valid management session is required; executing the uploaded file grants server privileges and can disrupt gateway operations.

The record

CVE
CVE-2023-5490
Published
Oct 10, 2023
Updated
Aug 2, 2024
Vendor
Byzoro
Product
Smart S45F
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20230928

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Byzoro · Smart S45Fversion=20230928

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo