CVE-2026-89334 json
Better Messages <= 2.15.33 - Missing Authorization to Authenticated (Custom+) Chat-Room Transcript Disclosure via '/thread/<id>' REST Endpoint
published 2026-09-19 51 d ago modified 2026-09-21 48 d ago also EUVD-2026-83475
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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'.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 50 d ago
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- wordplus Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/b3243fe4-9d11-49f0-884b-0162cd776993?source=cve
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/rest-api.php#L2598
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/rest-api.php#L181
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/rest-api.php#L418
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/functions.php#L3533
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/functions.php#L3582
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/functions.php#L3601
- plugins.trac.wordpress.org /browser/bp-better-messages/tags/2.15.33/inc/rest-api.php#L1964
- plugins.trac.wordpress.org /changeset?old_path=bp-better-messages%2Ftags%2F2.15.33%2Finc%2Ffunctions.php&new_path=bp-better-messages%2Fta
Sources
- CVE List CVE-2026-89334
- NVD CVE-2026-89334
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.