CVE-2026-27954

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 v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/LiveHelperChat/livehelperchat/security/advisories/GHSA-87wc-2p86-h3w7	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:livehelperchat:live_helper_chat:*:*:*:*:*:*:*:*

History

28 Feb 2026, 00:56

Type	Values Removed	Values Added
CPE		cpe:2.3:a:livehelperchat:live_helper_chat::::::::
First Time		Livehelperchat live Helper Chat Livehelperchat
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.5
References	~~() https://github.com/LiveHelperChat/livehelperchat/security/advisories/GHSA-87wc-2p86-h3w7 -~~	() https://github.com/LiveHelperChat/livehelperchat/security/advisories/GHSA-87wc-2p86-h3w7 - Mitigation, Vendor Advisory

26 Feb 2026, 02:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-26 02:16

Updated : 2026-02-28 00:56

NVD link : CVE-2026-27954

Mitre link : CVE-2026-27954

CVE.ORG link : CVE-2026-27954

JSON object : View

Products Affected

livehelperchat

live_helper_chat

CWE

CWE-862

Missing Authorization

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