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TI-2026-22298 Aliases CVE-2026-27954

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

Priority LOW 28CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0022 12th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
livehelperchatlivehelperchatup to 4.52—No fix listedCNA
  • livehelperchat Vendorlivehelperchat Affected up to 4.52 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:livehelperchat:live_helper_chat:*:*:*:*:*:*:*:*up to 4.52Vulnerablelivehelperchat
  • cpe:2.3:a:livehelperchat:live_helper_chat:*:*:*:*:*:*:*:* Versions up to 4.52 Vulnerable ·livehelperchat

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27954

References

Advisory 1

  • TI-2024-18290 Server-Side Template Injection (SSTI) vulnerability in livehelperchat before 4.34v… CVSS 3.1CRITICAL 9.8
  • TI-2025-32325 A stored cross-site scripting (XSS) vulnerability in the department assignment editing… CVSS 3.1MEDIUM 6.5
  • TI-2025-32324 A stored cross-site scripting (XSS) vulnerability in the chat transfer function of Live… CVSS 3.1MEDIUM 5.4
  • TI-2025-32323 A stored cross-site scripting (XSS) vulnerability in the Personal Canned Messages of Live… CVSS 3.1MEDIUM 5.4
  • TI-2025-32322 A stored cross-site scripting (XSS) vulnerability in the Facebook registration page of… CVSS 3.1MEDIUM 5.4
  • TI-2025-32321 A stored cross-site scripting (XSS) vulnerability in the Facebook Chat module of Live… CVSS 3.1MEDIUM 5.4
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences