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CVE-2026-27954— LiveHelperChat has department-level authorization bypass in holdaction, blockuser, and transferchat endpoints

Quick assessment

Affected
LiveHelperChat livehelperchat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Live Helper Chat是个人开发者（Live Helper Chat）的一款开源的支持在线聊天的插件。为web平台提供聊天功能。 Live Helper Chat 4.52及之前版本存在安全漏洞，该漏洞源于加载聊天对象时未检查访问权限，可能导致水平权限提升。

AI Predicted 5.6 Difficulty: Easy EPSS 0.34% · P25
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I. Basic Information for CVE-2026-27954

Vulnerability Information
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Vulnerability Title
LiveHelperChat has department-level authorization bypass in holdaction, blockuser, and transferchat endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Live Helper Chat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Live Helper Chat是个人开发者（Live Helper Chat）的一款开源的支持在线聊天的插件。为web平台提供聊天功能。 Live Helper Chat 4.52及之前版本存在安全漏洞，该漏洞源于加载聊天对象时未检查访问权限，可能导致水平权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LiveHelperChat livehelperchat <= 4.52 -

II. Public POCs for CVE-2026-27954

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III. Intelligence Information for CVE-2026-27954

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IV. Related Vulnerabilities

Same product: livehelperchat
Same vendor: LiveHelperChat
Same weakness: CWE-862

V. Comments for CVE-2026-27954

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