CVE-2023-47090

Name: CVE-2023-47090
Creator: NVD / NIST
Published: 2023-10-30T17:15:52.467+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2023-47090 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.66%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Linuxfoundation	Nats-Server	>= 2.2.0, < 2.9.23
Linuxfoundation	Nats-Server	>= 2.10.0, < 2.10.2

References

http://www.openwall.com/lists/oss-security/2023/10/30/1Mailing List
https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23Vendor Advisory
https://www.openwall.com/lists/oss-security/2023/10/13/2Mailing List, Mitigation
http://www.openwall.com/lists/oss-security/2023/10/30/1Mailing List
https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23Vendor Advisory
https://www.openwall.com/lists/oss-security/2023/10/13/2Mailing List, Mitigation

Timeline

Published: Oct 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-47090?

How severe is CVE-2023-47090?

CVE-2023-47090 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2023-47090?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-47090?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST