CVE-2026-24673Public exploitNetwork attack vector

Unauthorized file writes via unchecked ZIP extraction

Published Feb 3, 2026 · Updated Feb 3, 2026

File upload validation bypass in Open eClass before 4.2 allows remote authenticated users to write prohibited file types via ZIP extraction. The built-in archive extractor writes ZIP members without applying the extension restrictions enforced by the direct-upload path. Access to the archive upload and extraction interface is required, and the demonstrated consequence is unauthorized file storage rather than file execution.

CVSS severity4.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

File upload validation bypass in Open eClass before 4.2 allows remote authenticated users to write prohibited file types via ZIP extraction. The built-in archive extractor writes ZIP members without applying the extension restrictions enforced by the direct-upload path. Access to the archive upload and extraction interface is required, and the demonstrated consequence is unauthorized file storage rather than file execution.

The record

CVE
CVE-2026-24673
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Greek Universities Network
Product
Open eClass
Classifications
CWE-434, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 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=< 4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Greek Universities Network · Open eClassversion=< 4.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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 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
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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