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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.

🗓️ 06 Nov 2023 08:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

NATS auth bypass via implicit $G user in authorization; earliest 2.2.0; affects 2.9.x and 2.10.x before 2.10.2.

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21 Feb 2026 06:45Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.16.5
EPSS0.00259
SSVC
1