CVE-2021-32641Network attack vector

Reflected XSS via unsanitized message input

Published Jun 4, 2021 · Updated Aug 3, 2024

Auth0 Lock before 11.30.1 allows remote attackers to execute arbitrary script in applications using reflected input. The flashMessage and languageDictionary rendering paths insert URL-derived or user-controlled text without sanitization, allowing HTML and JavaScript execution in the browser. Exploitation requires an application to use one of those features with attacker-influenced data; the impact is code execution in the affected page context.

CVSS severity6.1
Medium
EPSS probability1.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Auth0 Lock before 11.30.1 allows remote attackers to execute arbitrary script in applications using reflected input. The flashMessage and languageDictionary rendering paths insert URL-derived or user-controlled text without sanitization, allowing HTML and JavaScript execution in the browser. Exploitation requires an application to use one of those features with attacker-influenced data; the impact is code execution in the affected page context.

The record

CVE
CVE-2021-32641
Published
Jun 4, 2021
Updated
Aug 3, 2024
Vendor
Auth0
Product
Lock
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 11.30.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Auth0 · Lockversion=<= 11.30.0

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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