CVE-2021-46013: An unrestricted file upload vulnerability exists in Sourcecodester Free school management software 1.0

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-46013 is a critical-severity flaw (CVSS 9.8) affecting free school management software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An unrestricted file upload vulnerability exists in Sourcecodester Free school management software 1.0. An attacker can leverage this vulnerability to enable remote code execution on the affected web server. Once a php webshell containing "<?php system($_GET["cmd"]); ?>" gets uploaded it is saved into /uploads/exam_question/ directory, and is accessible by all users.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Weakness	CWE-434
Published	2022-01-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: free school management software project

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

Am I affected?

Timeline

2022-01-18 18:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

free school management software project free school management software DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy free-school-management-software || rpm -q free-school-management-software || free-school-management-software --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison free-school-management-software sudo apt install free-school-management-software=<VERSION_BEFORE_1.0> sudo apt-mark hold free-school-management-software

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list free-school-management-software sudo dnf downgrade free-school-management-software-<VERSION_BEFORE_1.0> sudo dnf versionlock add free-school-management-software

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-46013?

free school management software: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-46013 being exploited?

CVE-2021-46013 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-2021-46013 affect?

CVE-2021-46013 affects free school management software. Severity is critical (CVSS 9.8). An unrestricted file upload vulnerability exists in Sourcecodester Free school management software 1.0. An attacker can leverage this vulnerability to enable remote code execution on the affected web server. Once a php webshell containing "

How urgent is CVE-2021-46013?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

References

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