What is CVE-2024-26503?

CVE-2024-26503 is a critical-severity vulnerability in Openeclass, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2024-03-14.

How severe is CVE-2024-26503?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2024-26503 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Openeclass

CVE-2024-26503

Unrestricted File Upload vulnerability in Greek Universities Network Open eClass v.3.15 and earlier allows attackers to run arbitrary code via upload of crafted file to certbadge.php endpoint.

Vulnerability class: Unrestricted File Upload

Published 2024-03-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (65.2th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Openeclass

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

www.less-secure.com/2024/03/open-eclass-cve-2024-26503-unrestricted.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-26503?: CVE-2024-26503 is a critical-severity vulnerability in Openeclass, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2024-03-14.
How severe is CVE-2024-26503?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2024-26503 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.