What is CVE-2018-6873?

CVE-2018-6873 is a critical-severity vulnerability in Auth0 Auth0.js, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-04-04.

How severe is CVE-2018-6873?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Auth0 Auth0.js

CVE-2018-6873

The Auth0 authentication service before 2017-10-15 allows privilege escalation because the JWT audience is not validated.

Vulnerability class: Broken Authentication

Published 2018-04-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.022 · change: -0.000

Affected products

Auth0 Auth0.js

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.securityfocus.com/bid/103695 (VDB Entry, Third Party Advisory, vdb-entry)
auth0.com/docs/security/bulletins/cve-2018-6873 (Vendor Advisory)

Frequently asked questions

What is CVE-2018-6873?: CVE-2018-6873 is a critical-severity vulnerability in Auth0 Auth0.js, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-04-04.
How severe is CVE-2018-6873?: Critical severity. CVSS v3 base score is 9.8 out of 10.