CVE-2026-89334

Better Messages <= 2.15.33 - Missing Authorization to Authenticated (Custom+) Chat-Room Transcript Disclosure via '/thread/<id>' REST Endpoint

2026-09-18 13:52
Supakiad S. (m3ez)

Strategic Overview

Status
Patched in 3.0.0
Affected Plugin
Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots
Affected Version
<= 2.15.33
CVSS
6.5Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-89334
View all Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots vulnerabilities

At a glance

CVE-2026-89334 is a medium-severity Missing Authorization vulnerability in the Better Messages WordPress plugin, affecting versions <= 2.15.33. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires an authenticated account at Custom level or above. The issue is fixed in version 3.0.0; sites on affected versions should update now. Disclosed September 2026, reported by Supakiad S. (m3ez).

Vulnerability Overview

The Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.15.33. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with custom-level access and above, to access the full message transcript, thread metadata, and user data of any chat-room thread without authentication. This is only exploitable when the chat room's only_joined_can_read setting retains its default value of '0'.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-862: Missing Authorization

Reaching this weakness in Better Messages <= 2.15.33 takes an account at Custom level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Better Messages the fix is 3.0.0: builds <= 2.15.33 are affected, anything from 3.0.0 onward is not.

Remediation

Update to version 3.0.0, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Better Messages 3.0.0 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-89334https://www.wordfence.com/threat-intel/vulnerabilities/id/b3243fe4-9d11-49f0-884b-0162cd776993https://nvd.nist.gov/vuln/detail/CVE-2026-89334

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C