Information disclosure in Auth0 Auth0-Wcf-Service-Jwt

CVE-2019-7644

Auth0 Auth0-WCF-Service-JWT before 1.0.4 leaks the expected JWT signature in an error message when it cannot successfully validate the JWT signature. If this error message is presented to an attacker, they can forge an arbitrary JWT token that will be accepted by the vulnerable application.

Published · last modified .

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: 0.017 (76.4th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2019-7644: held from 0.017 to 0.017.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2019-7644?
CVE-2019-7644 is a critical-severity vulnerability in Auth0 Auth0-Wcf-Service-Jwt, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 9.8/10. Published 2019-04-11.
How severe is CVE-2019-7644?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2019-7644 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.