CVE-2026-65644

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-21 · updated 2026-10-26
Weakness: CWE-79

Description

Rocket.Chat in versions before 8.8.0, 8.7.1, 8.6.2, 8.5.3, 8.4.6, 8.3.8, 8.2.8, 8.1.8, and 7.10.15 has a REST API endpoint POST /api/v1/livechat/visitor that accepts an unauthenticated, unsanitized name field for Livechat visitors. This name is stored raw and later rendered via dangerouslySetInnerHTML in the Omnichannel Queue side panel (InquireSidePanelItem.tsx), injecting a real, clickable HTML link - pointing to any attacker-controlled domain, with arbitrary social-engineering text - into the DOM of any agent viewing the queue.

Affected products

Rocket.Chat: before 7.10.15; from 8.1.0 before 8.1.8; from 8.2.0 before 8.2.8; from 8.3.0 before 8.3.8; from 8.4.0 before 8.4.6; from 8.5.0 before 8.5.3 — fixed in 7.10.15, 8.1.8, 8.2.8, 8.3.8, 8.4.6, 8.5.3

How to fix

Upgrade to a fixed version: Rocket.Chat 7.10.15, 8.1.8, 8.2.8, 8.3.8. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-65644 or the next vulnerability affects your stack