XSS in Auth0 Lock

CVE-2019-20174

Auth0 Lock before 11.21.0 allows XSS when additionalSignUpFields is used with an untrusted placeholder.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.007 (50.3th percentile) — read the EPSS interpretation.

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.

Affected products

Auth0 Lock
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

ossf-cve-benchmark/CVE-2019-20174

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)
cve@mitre.org (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2019-20174?: CVE-2019-20174 is a medium-severity vulnerability in Auth0 Lock, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-03.
How severe is CVE-2019-20174?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-20174 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.