CVE-2021-4049Network attack vector

Forced logout via missing CSRF validation

Published Dec 7, 2021 · Updated Aug 3, 2024

Cross-site request forgery in Live Helper Chat before 2.0 allows remote attackers to log out authenticated users through a crafted website. The user/logout route performed the logout action without validating a CSRF token, so a cross-origin request could terminate the active session. Exploitation requires a logged-in user to visit an attacker-controlled page; the documented consequence is session termination without account damage.

CVSS severity4.3
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Live Helper Chat before 2.0 allows remote attackers to log out authenticated users through a crafted website. The user/logout route performed the logout action without validating a CSRF token, so a cross-origin request could terminate the active session. Exploitation requires a logged-in user to visit an attacker-controlled page; the documented consequence is session termination without account damage.

The record

CVE
CVE-2021-4049
Published
Dec 7, 2021
Updated
Aug 3, 2024
Vendor
LiveHelperChat
Product
Live Helper Chat
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 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 <2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LiveHelperChat · Live Helper Chatversion=unspecified <2.0

Published CVSS scores

4.3huntr.devCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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