CVE-2026-24671Public exploitNetwork attack vector

Arbitrary JavaScript via unencoded stored input

Published Feb 3, 2026 · Updated Feb 3, 2026

Stored XSS in Greek Universities Network Open eClass before 4.2 allows remote authenticated users to run JavaScript in other users' sessions. Course document metadata, file names, course titles and codes, grader comments, and attendance titles are stored and rendered into HTML without proper sanitization or encoding. Teacher or administrator access is required to plant a payload, and a victim must open an affected page; the script then runs with that victim's session privileges.

CVSS severity6.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Greek Universities Network Open eClass before 4.2 allows remote authenticated users to run JavaScript in other users' sessions. Course document metadata, file names, course titles and codes, grader comments, and attendance titles are stored and rendered into HTML without proper sanitization or encoding. Teacher or administrator access is required to plant a payload, and a victim must open an affected page; the script then runs with that victim's session privileges.

The record

CVE
CVE-2026-24671
Published
Feb 3, 2026
Updated
Feb 3, 2026
Vendor
Greek Universities Network
Product
Open eClass
Classifications
CWE-79, CAPEC-592, T1189
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

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=< 4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Greek Universities Network · Open eClassversion=< 4.2

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
6.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1189Drive-by Compromise

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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