Is CVE-2026-27954 actively exploited?

No active exploitation of CVE-2026-27954 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27954 be exploited remotely?

Yes. CVE-2026-27954 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27954?

CVE-2026-27954 has a CVSS score of 6.5 (MEDIUM) and an EPSS exploitation probability of 0.03%.

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MEDIUM

CVE-2026-27954

CWE-862Published: February 26, 2026· Updated: Feb 28, 2026

6.5

CVSS v3.1

EPSS:0.02%probability of exploitation in 30 daysPercentile:6.3th

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.

NVD Source

Technical Analysis

CVE-2026-27954 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 6.5.