What’s Vulnerable › Vulnerabilities

CVE-2019-20174

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-03 · updated 2026-06-17
• Weakness: CWE-79

Description

Auth0 Lock before 11.21.0 allows XSS when additionalSignUpFields is used with an untrusted placeholder.

Affected products

• auth0 lock: before 11.21.0 — fixed in 11.21.0

How to fix

Upgrade to a fixed version: auth0 lock 11.21.0. Check the vendor advisory for mitigations.

References

• https://auth0.com/docs/security/bulletins/cve-2019-20174
• https://github.com/auth0/lock/releases/tag/v11.21.0
• https://auth0.com/docs/security/bulletins/cve-2019-20174
• https://github.com/auth0/lock/releases/tag/v11.21.0

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