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CVE-2019-20174

21
FAUCET Score

CVE-2019-20174 describes a Cross-Site Scripting (XSS) vulnerability in Auth0 Lock versions prior to 11.21.0. This flaw occurs when the "additionalSignUpFields" feature is used with an untrusted placeholder, allowing for the injection of malicious scripts. The vulnerability has a CVSS score of 6.1 (Medium), indicating a low attack complexity and requiring user interaction, with potential impacts on confidentiality and integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 11.21.0CPE matchmatch criteria
cpe:2.3:a:auth0:lock:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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 Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 56th percentile among its peer group of 26,209 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: auth0-lockFixed in: 11.21.0

Vendor Advisories (1)

npmGHSA-w2pf-g6r8-pg22medium

auth0-lock vulnerable to XSS via unsanitized placeholder property

Jan 31, 2020

References

auth0.com / docs/security/bulletins/cve-2019-20174
ExploitVendor Advisory
github.com / auth0/lock/releases/tag/v11.21.0
Release NotesThird Party Advisory