What is CVE-2026-87764?

CVE-2026-87764 is a high-severity vulnerability in Buddypress Instant Chat, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-11.

How severe is CVE-2026-87764?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Buddypress Instant Chat

CVE-2026-87764

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-11 · last modified 2026-10-11.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Buddypress Instant Chat

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

wpscan.com/vulnerability/4c8836ae-5a1f-48ca-96fd-50a85e014cf6/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-87764?: CVE-2026-87764 is a high-severity vulnerability in Buddypress Instant Chat, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-11.
How severe is CVE-2026-87764?: High severity. CVSS v3 base score is 8.8 out of 10.