CVE-2026-87764CWE-79cross-site-scripting

CVE-2026-87764

High · published October 11, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
19.0
In the wild
Unconfirmed
What it 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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00276 · 19.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-11T11:17Z
References (1)
https://wpscan.com/vulnerability/4c8836ae-5a1f-48ca-96fd-50a85e014cf6/ · [email protected]
EPSS history
Timeline
  • 12 OCT 03:31Z
    EPSS moved — → 0%
    epss
  • 11 OCT 06:00Z
    BuddyPress Instant Chat <= 1.6 - Unauthenticated Stored XSS via Chat Message
    cvelistv5
  • 11 OCT 06:00Z
    BuddyPress Instant Chat <= 1.6 - Unauthenticated Stored XSS via Chat Message
    cvelistv5