CVE-2023-5277Public exploitNetwork attack vector

Authenticated code execution via unrestricted avatar upload

Published Sep 29, 2023 · Updated Jun 18, 2025

Unrestricted file upload in Engineers Online Portal 1.0 allows remote authenticated users to execute code through a crafted avatar. The student_avatar.php handler processes the change action without restricting dangerous uploaded file types. A low-privileged portal account can place server-executable content in the web application, exposing portal data and the web-server process.

CVSS severity9.8
Critical
EPSS probability0.82%
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 Engineers Online Portal 1.0 allows remote authenticated users to execute code through a crafted avatar. The student_avatar.php handler processes the change action without restricting dangerous uploaded file types. A low-privileged portal account can place server-executable content in the web application, exposing portal data and the web-server process.

The record

CVE
CVE-2023-5277
Published
Sep 29, 2023
Updated
Jun 18, 2025
Vendor
Online Computer and Laptop Store Project
Product
Engineers Online Portal
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Online Computer and Laptop Store Project · Engineers Online Portalversion=1.0

Published CVSS scores

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