CVE-2023-47090: Linuxfoundation Nats-Server

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

NATS nats-server before 2.9.23 and 2.10.x before 2.10.2 has an authentication bypass. An implicit $G user in an authorization block can sometimes be used for unauthenticated access, even when the intention of the configuration was for each user to have an account. The earliest affected version is 2.2.0.

Affected products

• Linuxfoundation Nats-Server: from 2.2.0, before 2.9.23 (fixed in 2.9.23); from 2.10.0, before 2.10.2 (fixed in 2.10.2)

Published 2023-10-30. Last modified 2026-06-17.