CVE-2019-20174 auth0-lock vulnerable to XSS via unsanitized placeholder property

MediumCVSS 6.1 EPSS 0.72%

Published: 2020-02-03 19:13
Updated: 2026-06-17 05:30
Exploit status: No public exploit known

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Description

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

Affected products

Product	Affected versions	Fixed in
npm auth0-lock(npm)	< 11.21.0	11.21.0
auth0 lock	< 11.21.0	11.21.0

References

github.com vendor-advisory
github.com patch
github.com release-notes third-party-advisory
nvd.nist.gov third-party-advisory
auth0.com exploit vendor-advisory
github.com

CVSS v3.1

6.1 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

All scores (3)

v3.1 6.1 · nvd@nist.gov
v3.1 6.1 · github
v2.0 4.3 · nvd@nist.gov

Weakness & likelihood

EPSS (exploitation probability, 30 days): 0.72% (percentile 54.6)
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.