CVE-2024-26503: Unrestricted File Upload vulnerability in Greek Universities Network Open eClass v.3.15 and earlier allows att

Q: How do I fix CVE-2024-26503?

openeclass: upgrade to newer than 3.15. Exact commands for each OS are on this page.

Q: Is CVE-2024-26503 being exploited?

CVE-2024-26503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-26503 affect?

CVE-2024-26503 affects openeclass. Severity is critical (CVSS 9.1). 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.

Q: How urgent is CVE-2024-26503?

Priority 59/100. Critical severity; Public exploit reference

This month

CRITICAL 9.1UPGRADE

CVE-2024-26503 is a critical-severity flaw (CVSS 9.1) affecting openeclass. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-03-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openeclass

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-03-14 22:15 UTCPublished CVE record published
2026-06-17 07:17 UTCUpdated Record last modified

openeclass openeclass UPGRADE

Affected: <= 3.15

Fixed in: newer than 3.15

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openeclass || rpm -q openeclass || openeclass --version

2. UPGRADE to newer than 3.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openeclass

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openeclass

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Open eClass 3.15 - RCE

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-26503?

openeclass: upgrade to newer than 3.15. Exact commands for each OS are on this page.

Is CVE-2024-26503 being exploited?

CVE-2024-26503 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-26503 affect?

CVE-2024-26503 affects openeclass. Severity is critical (CVSS 9.1). 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.

How urgent is CVE-2024-26503?

Priority 59/100. Critical severity; Public exploit reference

Software pages

PHP vulnerabilities

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References

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