CVE-2023-28356: Rocket.chat

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability has been identified where a maliciously crafted message containing a specific chain of characters can cause the chat to enter a hot loop on one of the processes, consuming ~120% CPU and rendering the service unresponsive.

Affected products

• Rocket.chat Rocket.chat: before 6.0.0 (fixed in 6.0.0)

Published 2023-05-11. Last modified 2026-06-17.