CVE-2021-40909: Cross site scripting (XSS) vulnerability in sourcecodester PHP CRUD without Refresh/Reload using Ajax and Data

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CRITICAL 9.6DOWNGRADE

CVE-2021-40909 is a critical-severity flaw (CVSS 9.6) affecting php crud without refresh\/reload using ajax and datatables tutorial. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross site scripting (XSS) vulnerability in sourcecodester PHP CRUD without Refresh/Reload using Ajax and DataTables Tutorial v1 by oretnom23, allows remote attackers to execute arbitrary code via the first_name, last_name, and email parameters to /ajax_crud.

Why this priority

Critical severity
Public exploit reference

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-79, CWE-89
Published	2022-01-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: php crud without refresh\/reload using ajax and datatables tutorial project

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

Am I affected?

Timeline

2022-01-24 16:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

php crud without refresh\/reload using ajax and datatables tutorial project php crud without refresh\/reload using ajax and datatables tutorial 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 php-crud-without-refreshreload-using-ajax-and-datatables-tutorial || rpm -q php-crud-without-refreshreload-using-ajax-and-datatables-tutorial || php-crud-without-refreshreload-using-ajax-and-datatables-tutorial --version

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

apt-cache madison php-crud-without-refreshreload-using-ajax-and-datatables-tutorial sudo apt install php-crud-without-refreshreload-using-ajax-and-datatables-tutorial=<VERSION_BEFORE_1.0> sudo apt-mark hold php-crud-without-refreshreload-using-ajax-and-datatables-tutorial

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

dnf --showduplicates list php-crud-without-refreshreload-using-ajax-and-datatables-tutorial sudo dnf downgrade php-crud-without-refreshreload-using-ajax-and-datatables-tutorial-<VERSION_BEFORE_1.0> sudo dnf versionlock add php-crud-without-refreshreload-using-ajax-and-datatables-tutorial

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-2021-40909?

php crud without refresh\/reload using ajax and datatables tutorial: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40909 being exploited?

CVE-2021-40909 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-2021-40909 affect?

CVE-2021-40909 affects php crud without refresh\/reload using ajax and datatables tutorial. Severity is critical (CVSS 9.6). Cross site scripting (XSS) vulnerability in sourcecodester PHP CRUD without Refresh/Reload using Ajax and DataTables Tutorial v1 by oretnom23, allows remote attackers to execute arbitrary code via the first_name, last_name, and email parame

How urgent is CVE-2021-40909?

Priority 59/100. Critical severity; Public exploit reference

Software pages

PHP vulnerabilities

References

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