Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M
CVE-2026-27954LiveHelperChat has department-level authorization bypass in holdaction, blockuser, and transferchat endpoints
Medium 4.9
In plain English
A medium-severity missing authorization in livehelperchat from LiveHelperChat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| LiveHelperChat | livehelperchat | <= 4.52 |
Weakness: CWE-862 · Vector: 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