An issue was discovered in Form Tools through 3.0.20.

published 2021-08-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24616

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

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.

Exploit prediction

1.35% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bernardofsr.github.io https://bernardofsr.github.io/blog/2021/form-tools/ referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/bernardofsr/CVEs-With-PoC/blob/main/PoCs/Form%20Tools/README.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

bernardofsr.github.io /blog/2021/form-tools/
exploit, third-party-advisory
github.com /bernardofsr/CVEs-With-PoC/blob/main/PoCs/Form%20Tools/README.md
exploit, third-party-advisory
formtools.org /
product, vendor-advisory
github.com /formtools/core
product, third-party-advisory

Sources

CVE List CVE-2021-38143
NVD CVE-2021-38143

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary