CVE-2026-87764Network attack vector

Unauthenticated stored XSS via unescaped chat messages

Published Oct 11, 2026 · Updated Oct 11, 2026

Stored XSS in BuddyPress Instant Chat 1.6 and earlier allows remote attackers to execute scripts via crafted chat messages. The insert_message method accepts a conversation ID without checking sender membership, and retrieve_messages renders stored message content without HTML escaping. Authentication is not required to insert messages; script execution requires a conversation member to view the affected chat and occurs in that member's browser session.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in BuddyPress Instant Chat 1.6 and earlier allows remote attackers to execute scripts via crafted chat messages. The insert_message method accepts a conversation ID without checking sender membership, and retrieve_messages renders stored message content without HTML escaping. Authentication is not required to insert messages; script execution requires a conversation member to view the affected chat and occurs in that member's browser session.

The record

CVE
CVE-2026-87764
Published
Oct 11, 2026
Updated
Oct 11, 2026
Vendor
Richard Phelps
Product
BuddyPress Instant Chat
Classifications
T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Richard Phelps · BuddyPress Instant Chatversion=0 <=1.6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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