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CVE-2019-7644

30
FAUCET Score

CVE-2019-7644 is a critical vulnerability affecting Auth0-WCF-Service-JWT versions prior to 1.0.4. It allows an attacker to forge arbitrary JSON Web Tokens (JWTs) by exploiting an error message that leaks the expected JWT signature when validation fails. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity, leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.4CPE matchmatch criteria
cpe:2.3:a:auth0:auth0-wcf-service-jwt:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.66%
Probability of exploitation in next 30 days
EPSS Percentile
74.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0166 is in the 62nd percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

nugetGHSA-qpvx-gpqm-g98jcritical

Critical severity vulnerability that affects Auth0-WCF-Service-JWT

Apr 18, 2019

References

auth0.com / docs/security/bulletins/cve-2019-7644
PatchVendor Advisory