What is CVE-2019-20173?

CVE-2019-20173 is a medium-severity vulnerability in Auth0 Login By, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-05.

How severe is CVE-2019-20173?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2019-20173 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Auth0 Login By

CVE-2019-20173

The Auth0 wp-auth0 plugin 3.11.x before 3.11.3 for WordPress allows XSS via a wle parameter associated with wp-login.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-02-05 · last modified 2026-06-17.

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: 0.025 (83.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Auth0 Login By

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

github.com/auth0/wp-auth0/releases/tag/3.11.3 (Third Party Advisory, Release Notes)
auth0.com/docs/security/bulletins/cve-2019-20173 (Vendor Advisory)
wpvulndb.com/vulnerabilities/10059 (Third Party Advisory)

Frequently asked questions

What is CVE-2019-20173?: CVE-2019-20173 is a medium-severity vulnerability in Auth0 Login By, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-05.
How severe is CVE-2019-20173?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2019-20173 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.