CVE-2021-4132Public exploitNetwork attack vector

Stored XSS via Angular expression injection

Published Dec 17, 2021 · Updated Aug 3, 2024

Cross-site scripting in Live Helper Chat through 3.90 allows remote authenticated users to execute script in an operator's browser. User account fields were rendered without Angular's ng-non-bindable attribute, allowing stored values to be interpreted as Angular expressions when account pages rendered. Exploitation requires an authenticated account and a victim operator viewing the affected page; impact is browser-session data exposure or actions performed in that operator context.

CVSS severity5.4
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Live Helper Chat through 3.90 allows remote authenticated users to execute script in an operator's browser. User account fields were rendered without Angular's ng-non-bindable attribute, allowing stored values to be interpreted as Angular expressions when account pages rendered. Exploitation requires an authenticated account and a victim operator viewing the affected page; impact is browser-session data exposure or actions performed in that operator context.

The record

CVE
CVE-2021-4132
Published
Dec 17, 2021
Updated
Aug 3, 2024
Vendor
LiveHelperChat
Product
Live Helper Chat
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 17, 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=unspecified <=3.90

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LiveHelperChat · Live Helper Chatversion=unspecified <=3.90

Published CVSS scores

7.3huntr.devCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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