CVE-2026-24673VulnerabilityPublished 3 Feb 2026

CVE-2026-24673: gunet openeclass · Unrestricted File Upload

Affects gunet openeclassSource CVE Database V5

Not known to be exploited · CVSS 4.3 Medium : upgrade to 4.2 when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.2

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade openeclass and gunet/openeclass to 4.2.

Affected software

Product	Affected	Fixed in
gunetopeneclass	Affected <4.2	Fixed in 4.2
GitHubgunet/openeclass`pkg:github/gunet/openeclass`Other threats	Affected <4.2	Fixed in 4.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

The primary mitigation is to upgrade all Open eClass deployments to version 4.2 or later, where the vulnerability has been patched. Organizations should audit their current versions and prioritize updates accordingly. In addition, implement strict server-side validation of uploaded files beyond extension checks, including MIME type verification and content inspection, especially for compressed archives. Employ sandboxing or isolated environments for handling file decompression to prevent malicious code execution. Monitor file upload logs for unusual patterns, such as frequent ZIP uploads or files with suspicious nested content. Educate administrators and users about the risks of uploading untrusted files. If immediate upgrading is not feasible, consider disabling file upload features temporarily or restricting upload permissions to trusted users only. Regularly review and update security policies related to file handling in the platform.

Description

CVE-2026-24673 is a medium-severity vulnerability in the Open eClass platform versions prior to 4.2 that allows attackers to bypass file upload restrictions by embedding disallowed file types inside ZIP archives. The platform’s built-in decompression extracts these files without proper validation, enabling potentially dangerous file uploads. Although the vulnerability does not directly impact confidentiality or availability, it can lead to integrity issues if malicious files are uploaded and executed. Exploitation requires network access and low privileges but no user interaction. The issue has been patched in version 4.2. European educational institutions using vulnerable Open eClass versions should prioritize updating to mitigate risks. Countries with widespread adoption of Open eClass and significant educational infrastructure are most at risk. Mitigations include upgrading to version 4.

Impact

For European organizations, particularly educational institutions using Open eClass versions prior to 4.2, this vulnerability poses a risk of unauthorized file uploads that can compromise system integrity. While it does not directly affect confidentiality or availability, malicious files uploaded through this flaw could be used to execute unauthorized code, implant malware, or manipulate course content, potentially disrupting educational services or damaging institutional reputation. The impact is heightened in environments where Open eClass is integrated with other critical systems or where uploaded files are executed or served to users. Given the widespread use of Open eClass in European academic institutions, exploitation could lead to localized incidents of data tampering or service misuse. However, the lack of known active exploits and the medium CVSS score suggest the threat is moderate but should not be underestimated due to the sensitive nature of educational data and services.

Summary

The vulnerability identified as CVE-2026-24673 affects the Open eClass platform, a widely used course management system, formerly known as GUnet eClass. Prior to version 4.2, the platform’s file upload mechanism inadequately validates file types when users upload compressed ZIP archives. Attackers can embed files with prohibited or dangerous extensions inside these archives, which the platform then decompresses and stores without proper extension or content validation. This bypasses the intended file upload restrictions, classified under CWE-434: Unrestricted Upload of File with Dangerous Type. Although the CVSS score is 4.3 (medium severity), the vulnerability primarily threatens the integrity of the system by allowing potentially malicious files to be introduced. The attack vector is network-based with low complexity and requires only low privileges, but no user interaction is necessary. No known exploits are currently reported in the wild. The vulnerability has been addressed in Open eClass version 4.2, which includes improved validation during decompression and file handling to prevent such bypasses. This flaw could be leveraged by attackers to upload scripts or executables that might be used for further exploitation, such as privilege escalation or lateral movement within affected educational environments.

CWE-434Unrestricted Upload of File with Dangerous Type (opens in a new tab)
Base weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #12OWASP Top 10 A06:2025: Insecure Design (opens in a new tab)
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
Architecture and Design
Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
Architecture and Design · Enforcement by Conversion
When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
Architecture and Design
Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
OWASP Cheat Sheets
Server Side Request Forgery Prevention (opens in a new tab)
Web Service Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
File Upload (opens in a new tab)
Secure Design Principles (opens in a new tab)
OWASP ASVS 4.0.3
V12.5.2 (opens in a new tab)
V13.1.5 (opens in a new tab)
V12.2.1 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

github.com/gunet/openeclass/security/advisories/GHSA-3g4j-56gp-v6wv (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Feb 2026, 11:57 UTC

WeaknessesCWE-434

Technical details

References

Community reviews

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