Reflected Cross-Site Scripting Vulnerability in Better Messages Plugin by WordPress
CVE-2026-18555

6.1MEDIUM

Key Information:

Vendor

WordPress
Status
Better Messages – Chat Rooms, Group Chat, Private Messages & Ai Chat Bots
Vendor
CVE Published:
16 September 2026

What is CVE-2026-18555?

The Better Messages plugin for WordPress is susceptible to Reflected Cross-Site Scripting (XSS) due to inadequate input validation and output encoding, particularly through the 'icn' parameter. This vulnerability allows unauthenticated attackers to relay malicious scripts in a user's browser session, which could lead to exposure of sensitive information or unauthorized actions if users are lured into clicking infected links.

Affected Version(s)

Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots 0 <= 2.15.22

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3634693/bp-b...

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonah Burgess (CryptoCat)
.