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CVE-2026-27954

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

Published: Feb 26, 2026Updated: Feb 28, 2026 Sources: CVE List NVDCWE-862
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 91.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

live helper chatlivehelperchat
On-premWeb App
Communications / messaging-chat
livehelperchatLiveHelperChat
Mixed
Communications / messaging-chat
livehelperchatoss-projectCommunicationsaka live helper chat, livehelperchat/livehelperchat, livehelperchat

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/LiveHelperChat/livehelperchat/security/advisories/GHSA-87wc-2p86-h3w7
github.com

Timeline

Published
Feb 26, 2026
Last Updated
Feb 28, 2026

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