How severe is CVE-2019-20174?

CVE-2019-20174 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-20174 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20174?

CVE-2019-20174 affects Auth0 Lock. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20174?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-20174 published?

CVE-2019-20174 was published on 2020-02-03 and last updated on 2026-06-17.

CVE-2019-20174

CVE-2019-20174 is a medium-severity vulnerability in Auth0 Lock with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Auth0 Lock
Published: 2020-02-03
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2019-20174?: Auth0 Lock before 11.21.0 allows XSS when additionalSignUpFields is used with an untrusted placeholder.
How severe is CVE-2019-20174?: CVE-2019-20174 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-20174 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20174?: CVE-2019-20174 affects Auth0 Lock. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20174?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-20174 published?: CVE-2019-20174 was published on 2020-02-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:auth0:lock:*:*:*:*:*:*:*:*

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