TI-2026-70469 Aliases CVE-2026-87764 GHSA-q3fq-h679-wfvh

Stored cross-site scripting in BuddyPress Instant Chat via chat messages

MEDIUM 40CWE-79Published 2026-10-11 · Updated 2026-10-11

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The BuddyPress Instant Chat WordPress plugin through 1.6 does not verify that a chat message sender belongs to the conversation the message is added to, and it does not escape message content on output. An unauthenticated attacker can store arbitrary web scripts that run in the session of any member who later views that conversation (CWE-79). An exploit link is included in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00276 20th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Unknown	BuddyPress Instant Chat	up to 1.6	—	No fix listed	CNA

BuddyPress Instant Chat VendorUnknown Affected up to 1.6 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for BuddyPress Instant Chat.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-11 Threatist record created from CVE-2026-87764
2026-10-11 Alias added: GHSA-q3fq-h679-wfvh
2026-10-12 Priority changed: LOW → MEDIUM

References

Exploit 1

https://wpscan.com/vulnerability/4c8836ae-5a1f-48ca-96fd-50a85e014cf6/

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences