wordplus Better Messages Plugin up to 2.15.33 on WordPress Guest Registration is_ai_bot_user X-Real-IP information disclosure

Summaryinfo

A vulnerability classified as problematic was found in wordplus Better Messages Plugin up to 2.15.33. Affected by this issue is the function is_ai_bot_user of the component Guest Registration. Executing a manipulation of the argument X-Real-IP can lead to information disclosure. This vulnerability appears as CVE-2026-89093. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in wordplus Better Messages Plugin up to 2.15.33 and classified as problematic. This vulnerability affects the function is_ai_bot_user of the component Guest Registration. The manipulation of the argument X-Real-IP with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

The Better Messages – Chat Rooms, Group Chat, Private Messages & AI Chat Bots plugin for WordPress is vulnerable to Information Exposure by Spoofing in all versions up to, and including, 2.15.33. This is due to the `is_ai_bot_user()` function identifying privileged internal AI bot accounts by performing a prefix check for `'ai-chat-bot-'` against a guest record's stored IP address, which is populated verbatim from the client-controlled `X-Real-IP` request header during unauthenticated guest registration. This makes it possible for unauthenticated attackers to register a guest identity that the plugin treats as its own internal AI bot, bypassing the per-room role allowlist, draft-status check, and join filters — which are all short-circuited by the bot check in `user_can_join()` and `user_can_read()` — to join administrator-restricted chat rooms, post messages into them, and read the private message history of other users.

The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-89093 since 09/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/19/2026). The MITRE ATT&CK project declares the attack technique as T1592.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• wordplus

Name

• Better Messages Plugin

Version

• 2.15.0
• 2.15.1
• 2.15.2
• 2.15.3
• 2.15.4
• 2.15.5
• 2.15.6
• 2.15.7
• 2.15.8
• 2.15.9
• 2.15.10
• 2.15.11
• 2.15.12
• 2.15.13
• 2.15.14
• 2.15.15
• 2.15.16
• 2.15.17
• 2.15.18
• 2.15.19
• 2.15.20
• 2.15.21
• 2.15.22
• 2.15.23
• 2.15.24
• 2.15.25
• 2.15.26
• 2.15.27
• 2.15.28
• 2.15.29
• 2.15.30
• 2.15.31
• 2.15.32
• 2.15.33

CPE 2.3info

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CPE 2.2info

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