CVE-2021-40909

Name: CVE-2021-40909
Creator: NVD / NIST
Published: 2022-01-24T16:15:08.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.6/10EPSS 2.18%

Last modified Jun 17, 2026

CVE-2021-40909 is a critical-severity vulnerability rated 9.6/10 on the CVSS scale. 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.. EPSS estimates a 2.18% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability

2.18%

80.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Php Crud Without Refresh\/Reload Using Ajax And Datatables Tutorial Project	Php Crud Without Refresh\/Reload Using Ajax And Datatables Tutorial	1.0

References

https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/oretnom23/CVE-nu11-10-09102021Exploit, Third Party Advisory
https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/oretnom23/CVE-nu11-10-09102021Exploit, Third Party Advisory

Timeline

Published: Jan 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40909?

How severe is CVE-2021-40909?

CVE-2021-40909 has a CVSS score of 9.6/10 (CRITICAL severity). The EPSS model estimates a 2.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40909?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40909?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST