CVE-2021-38143

Name: CVE-2021-38143
Creator: NVD / NIST
Published: 2021-08-31T05:15:06.563+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2021-38143 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Form Tools through 3.0.20. When an administrator creates a customer account, it is possible for the customer to log in and proceed with a change of name and last name. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

Description

An issue was discovered in Form Tools through 3.0.20. When an administrator creates a customer account, it is possible for the customer to log in and proceed with a change of name and last name. However, these fields are vulnerable to XSS payload insertion, being triggered in the admin panel when the admin tries to see the client list. This type of XSS (stored) can lead to the extraction of the PHPSESSID cookie belonging to the admin.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.35%

68.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Formtools	Core	<= 3.0.20

References

https://bernardofsr.github.io/blog/2021/form-tools/Exploit, Third Party Advisory
https://github.com/bernardofsr/CVEs-With-PoC/blob/main/PoCs/Form%20Tools/README.mdExploit, Third Party Advisory
https://github.com/formtools/coreProduct, Third Party Advisory
https://www.formtools.org/Product, Vendor Advisory
https://bernardofsr.github.io/blog/2021/form-tools/Exploit, Third Party Advisory
https://github.com/bernardofsr/CVEs-With-PoC/blob/main/PoCs/Form%20Tools/README.mdExploit, Third Party Advisory
https://github.com/formtools/coreProduct, Third Party Advisory
https://www.formtools.org/Product, Vendor Advisory

Timeline

Published: Aug 31, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38143?

How severe is CVE-2021-38143?

CVE-2021-38143 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38143?

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-2021-38143?

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

Scan your code now

Source: NVD / NIST