---
id: CVE-2026-87764
title: >-
  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
  unauthenti…
summary: >-
  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
  unauthenti…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-10-11'
updated: '2026-10-11'
sourceUpdated: '2026-10-11T12:17:25.390'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87764'
references:
  - url: 'https://wpscan.com/vulnerability/4c8836ae-5a1f-48ca-96fd-50a85e014cf6/'
    label: contact@wpscan.com
tags:
  - nvd
ingestedAt: '2026-10-11T08:44:24.723Z'
epss: 0.00172
epssPercentile: 0.06077
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.