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Fencer Vulns
medium 6.5

CVE-2023-47090 json

NATS.io: Adding accounts for just the system account adds auth bypass

published 2023-10-19 3 y ago modified 2026-09-10 1 mo ago also EUVD-2023-2730 , GHSA-fr2g-9hjm-wr23 , GO-2023-2133 , JLSEC-2026-1119

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/nats-io/nats-server/v2 2.9.23, 2.10.2
  • julia nats_server_jll 2.10.18+0
  • linuxfoundation nats-server 2.9.23, 2.10.2
  • nats-server Debian 14, Debian 13 2.10.3-1

debian advisories DEBIAN-CVE-2023-47090

  • telegraf CBL-Mariner 2.0 1.28.5-1
  • telegraf Azure Linux 3.0 1.29.4-1

azure linux advisories AZL-31779AZL-35301

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.83% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/nats-io/nats-server/v2
>=2.2.0, <2.9.23
>=2.10.0, <2.10.2
2.9.23
2.10.2
julia nats_server_jll
<2.10.18+0
2.10.18+0

Classification

Weakness
  • CWE-305 Authentication Bypass by Primary Weakness
  • CWE-863 Incorrect Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.