CVE-2021-40577: A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Enrollment Management System

This month

MEDIUM 5.4DOWNGRADE

CVE-2021-40577 is a medium-severity flaw (CVSS 5.4) affecting online enrollment management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Enrollment Management System in PHP and PayPal Free Source Code 1.0 in the Add-Users page via the Name parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: online enrollment management system project

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

Am I affected?

Timeline

2021-11-08 18:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

online enrollment management system project online enrollment management system 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 online-enrollment-management-system || rpm -q online-enrollment-management-system || online-enrollment-management-system --version

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

apt-cache madison online-enrollment-management-system sudo apt install online-enrollment-management-system=<VERSION_BEFORE_1.0> sudo apt-mark hold online-enrollment-management-system

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

dnf --showduplicates list online-enrollment-management-system sudo dnf downgrade online-enrollment-management-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add online-enrollment-management-system

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.

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: Online Enrollment Management System in PHP and PayPal 1.0 - 'U_NAME' Stored Cross-Site Scripting

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-2021-40577?

online enrollment management system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40577 being exploited?

CVE-2021-40577 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-2021-40577 affect?

CVE-2021-40577 affects online enrollment management system. Severity is medium (CVSS 5.4). A Stored Cross Site Scripting (XSS) vulnerability exists in Sourcecodester Online Enrollment Management System in PHP and PayPal Free Source Code 1.0 in the Add-Users page via the Name parameter.

How urgent is CVE-2021-40577?

Priority 43/100. Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-44599 HIGH 7.5 DOWNGRADE The id parameter from Online Enrollment Management System 1.0 system appears to be vulnerable to SQL injection
CVE-2021-40579 MEDIUM 6.5 DOWNGRADE https://www.sourcecodester.com/ Online Enrollment Management System in PHP and PayPal Free Source Code 1.0 is

References

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