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CVE-2026-27954

LiveHelperChat has department-level authorization bypass in holdaction, blockuser, and transferchat endpoints

Live Helper Chat is an open-source application that enables live support websites. In versions up to and including 4.52, three chat action endpoints (holdaction.php, blockuser.php, and transferchat.php) load chat objects by ID without calling `erLhcoreClassChat::hasAccessToRead()`, allowing operators to act on chats in departments they are not assigned to. Operators with the relevant role permissions (holduse, allowblockusers, allowtransfer) can hold, block users from, or transfer chats in departments they are not assigned to. This is a horizontal privilege escalation within one organization. As of time of publication, no known patched versions are available.

CVSS 4.0 · 4.9 Medium EPSS < 1% KEV · Not listed
Vendors
CVE-2025-51398

A stored cross-site scripting (XSS) vulnerability in the Facebook registration page of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Name parameter.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
CVE-2025-51403

A stored cross-site scripting (XSS) vulnerability in the department assignment editing module of of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Alias Nick parameter.

CVSS 3.1 · 6.5 Medium EPSS 1.6% KEV · Not listed
Vendors
CVE-2025-51401

A stored cross-site scripting (XSS) vulnerability in the chat transfer function of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the operator name parameter.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
CVE-2025-51400

A stored cross-site scripting (XSS) vulnerability in the Personal Canned Messages of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
CVE-2025-51397

A stored cross-site scripting (XSS) vulnerability in the Facebook Chat module of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Surname parameter under the Recipient' Lists.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2025-51396

A stored cross-site scripting (XSS) vulnerability in Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Telegram Bot Username parameter.

CVSS 3.1 · 5.4 Medium EPSS 1.0% KEV · Not listed
Vendors
CVE-2022-0394

Cross-site Scripting (XSS) - Stored in livehelperchat/livehelperchat

Cross-site Scripting (XSS) - Stored in Packagist remdex/livehelperchat prior to 3.93v.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2024-27516

Server-Side Template Injection (SSTI) vulnerability in livehelperchat before 4.34v, allows remote attackers to execute arbitrary code and obtain sensitive information via the search parameter in lhc_web/modules/lhfaq/faqweight.php.

CVSS 3.1 · 9.8 Critical EPSS 1.5% KEV · Not listed
Vendors
CVE-2017-1000059

Live Helper Chat version 2.06v and older is vulnerable to Cross-Site Scripting in the HTTP Header handling resulting in the execution of any user provided Javascript code in the session of other users.

CVSS 3.0 · 6.1 Medium EPSS 1.1% KEV · Not listed
Vendors
Products
CVE-2022-1530

Cross-site Scripting (XSS) in livehelperchat/livehelperchat

Cross-site Scripting (XSS) in GitHub repository livehelperchat/livehelperchat prior to 3.99v. The attacker can execute malicious JavaScript on the application.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-1235

Weak secrethash can be brute-forced in livehelperchat/livehelperchat

Weak secrethash can be brute-forced in GitHub repository livehelperchat/livehelperchat prior to 3.96.

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-1234

XSS in livehelperchat in livehelperchat/livehelperchat

XSS in livehelperchat in GitHub repository livehelperchat/livehelperchat prior to 3.97. This vulnerability has the potential to deface websites, result in compromised user accounts, and can run malicious code on web pages, which can lead to a compromise of the user’s device.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-1213

SSRF filter bypass port 80, 433 in livehelperchat/livehelperchat

SSRF filter bypass port 80, 433 in GitHub repository livehelperchat/livehelperchat prior to 3.67v. An attacker could make the application perform arbitrary requests, bypass CVE-2022-1191

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-1191

SSRF on index.php/cobrowse/proxycss/ in livehelperchat/livehelperchat

SSRF on index.php/cobrowse/proxycss/ in GitHub repository livehelperchat/livehelperchat prior to 3.96.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-1176

Loose comparison causes IDOR on multiple endpoints in livehelperchat/livehelperchat

Loose comparison causes IDOR on multiple endpoints in GitHub repository livehelperchat/livehelperchat prior to 3.96.

CVSS 3.1 · 7.5 High EPSS 1.2% KEV · Not listed
Vendors
Products
CVE-2022-0935

Host Header injection in password Reset in livehelperchat/livehelperchat

Host Header injection in password Reset in GitHub repository livehelperchat/livehelperchat prior to 3.97.

CVSS 3.1 · 8.8 High EPSS 1.3% KEV · Not listed
Vendors
Products
CVE-2022-0612

Cross-site Scripting (XSS) - Stored in livehelperchat/livehelperchat

Cross-site Scripting (XSS) - Stored in Packagist remdex/livehelperchat prior to 3.93v.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-0502

Cross-site Scripting (XSS) - Stored in livehelperchat/livehelperchat

Cross-site Scripting (XSS) - Stored in Packagist remdex/livehelperchat prior to 3.93v.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Products
CVE-2022-0395

Cross-site Scripting (XSS) - Stored in livehelperchat/livehelperchat

Cross-site Scripting (XSS) - Stored in Packagist remdex/livehelperchat prior to 3.93v.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Products