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CVE-2019-16929

23
FAUCET Score

CVE-2019-16929 describes an Incorrect Access Control vulnerability in Auth0's auth0.net library, specifically versions prior to 6.5.4. This flaw allows the IdentityTokenValidator to inadvertently validate untrusted ID tokens, potentially leading to unauthorized access. Rated as High severity with a CVSS score of 7.5, the vulnerability is easily exploitable over the network with low complexity and no user interaction, impacting integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.8.0, <= 6.5.3CPE matchmatch criteria
cpe:2.3:a:auth0:auth0.net:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.89%
Probability of exploitation in next 30 days
EPSS Percentile
55.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0089 is in the 30th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

nugetpatch availablevia ghsa
Product: Auth0.AuthenticationApiFixed in: 6.5.4

Vendor Advisories (1)

nugetGHSA-c9cg-q8r2-xvjqhigh

Improper Authentication in Auth0.AuthenticationApi

Oct 24, 2019

References

auth0.com / docs/security/bulletins/cve-2019-16929
Vendor Advisory