How severe is CVE-2018-6873?

CVE-2018-6873 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-6873 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6873?

CVE-2018-6873 affects Auth0 Auth0.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6873?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-6873 published?

CVE-2018-6873 was published on 2018-04-04 and last updated on 2026-06-17.

CVE-2018-6873

CVE-2018-6873 is a critical-severity vulnerability in Auth0 Auth0.js with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Auth0 Auth0.js
Published: 2018-04-04
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2018-6873?: The Auth0 authentication service before 2017-10-15 allows privilege escalation because the JWT audience is not validated.
How severe is CVE-2018-6873?: CVE-2018-6873 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-6873 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6873?: CVE-2018-6873 affects Auth0 Auth0.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6873?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-6873 published?: CVE-2018-6873 was published on 2018-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:auth0:auth0.js:*:*:*:*:*:*:*:*

More vulnerabilities in Auth0 Auth0.js

CVE-2018-6874 — High (CVSS 8.8): CSRF exists in the Auth0 authentication service through 14591 if the Legacy Lock API flag is enabled.
CVE-2018-7307 — High (CVSS 8.8): The Auth0 Auth0.js library before 9.3 has CSRF because it mishandles the case where the authorization response lacks…
CVE-2020-15125 — High (CVSS 7.7): In auth0 (npm package) versions before 2.27.1, a DenyList of specific keys that should be sanitized from the request…
CVE-2017-17068 — High (CVSS 7.5): A cross-origin vulnerability has been discovered in the Auth0 auth0.js library affecting versions < 8.12. This…
CVE-2026-42280 — High (CVSS 7.1): Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under specific preconditions, the…
CVE-2020-5263 — Medium (CVSS 5.5): auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case…

All CVEs affecting Auth0 Auth0.js →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-20317 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Workload engineering…
CVE-2026-19977 — Critical (CVSS 10.0): A vulnerability was detected in EFM ipTIME A3004T 14.19.0. The affected element is the function…
CVE-2026-59500 — Critical (CVSS 10.0): CWE-287: Improper Authentication
CVE-2024-27253 — Critical (CVSS 10.0): IBM DOORS Next 7.0.3 through 7.0.3 Interim Fix 018 could allow an authenticated user to bypass security logic to…
CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-62825 — Critical (CVSS 10.0): Improper authentication in Azure Key Vault allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-287 (Improper Authentication) vulnerabilities →