BuddyPress Instant Chat Plugin up to 1.6 on WordPress Chat Message cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in BuddyPress Instant Chat Plugin up to 1.6. Affected by this vulnerability is an unknown functionality of the component Chat Message Handler. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-87764. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in BuddyPress Instant Chat Plugin up to 1.6 and classified as problematic. Affected by this vulnerability is an unknown functionality of the component Chat Message Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

The BuddyPress Instant Chat WordPress plugin through 1.6 does not check that the sender of a chat message belongs to the conversation it is being added to, nor does it escape message content before outputting it back, allowing unauthenticated users to store arbitrary web scripts that will execute in the session of any member who later views that conversation.

It is possible to read the advisory at wpscan.com. This vulnerability is known as CVE-2026-87764 since 09/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-96772). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• BuddyPress Instant Chat Plugin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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