How severe is CVE-2019-7644?

CVE-2019-7644 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-2019-7644 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-7644?

CVE-2019-7644 affects Auth0 Auth0-wcf-service-jwt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-7644?

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-2019-7644 published?

CVE-2019-7644 was published on 2019-04-11 and last updated on 2026-06-17.

CVE-2019-7644

CVE-2019-7644 is a critical-severity vulnerability in Auth0 Auth0-wcf-service-jwt 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-209.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-209
Affected product: Auth0 Auth0-wcf-service-jwt
Published: 2019-04-11
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-7644?: CVE-2019-7644 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-2019-7644 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-7644?: CVE-2019-7644 affects Auth0 Auth0-wcf-service-jwt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-7644?: 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-2019-7644 published?: CVE-2019-7644 was published on 2019-04-11 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:auth0:auth0-wcf-service-jwt:*:*:*:*:*:*:*:*

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