CVE-2019-7644

9.8 criticalEPSS 1.7%

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.

Severity

CVSS 3.0

9.8 critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.7% chance of exploitation in the next 30 days; higher than 77% of CVEs (scores of 2026-10-31)
CWE: CWE-209
Published: 2019-04-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

auth0:auth0-wcf-service-jwt

References

https://auth0.com/docs/security/bulletins/cve-2019-7644
https://auth0.com/docs/security/bulletins/cve-2019-7644

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