XSS in Formtools Core
CVE-2021-38143
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.014 (70.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 70.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.formtools.org/ (Product, Vendor Advisory)
- github.com/formtools/core (Product, Third Party Advisory)
- bernardofsr.github.io/blog/2021/form-tools/ (Exploit, Third Party Advisory)
- github.com/bernardofsr/CVEs-With-PoC/blob/main/PoCs/Form Tools/README.md (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-38143?
- CVE-2021-38143 is a medium-severity vulnerability in Formtools Core, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-08-31.
- How severe is CVE-2021-38143?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-38143 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.