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Advisory record · GHSA-fr2g-9hjm-wr23

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

No CVSS scoreEPSS 0.0083 · 57th percentile

Published by the GitHub Advisory Database at 19 Oct 2023, 16:13 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/nats-io/nats-server/v2Go>=2.2.0, <2.9.23 || >=2.10.0, <2.10.22.9.23, 2.10.2
Identifiers
GHSA-fr2g-9hjm-wr23 · CVE-2023-47090 · GO-2023-2133
Weakness (CWE)
CWE-305
Tags
Published
19 Oct 2023
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of github.com/nats-io/nats-server/v2 from 2.2.0 up to 2.9.23 (excluding it) and from 2.10.0 up to 2.10.2 (excluding it) are affected. When an "accounts" block contains only the system account, the server can let clients connect without authentication, so an attacker with network access to the server can connect without credentials. Upgrade to 2.9.23 or 2.10.2; alternatively, add a second non-system account to the accounts block.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

No source has published a CVSS score for this record yet.

  • CISA KEV Not listed.
  • EPSS 0.0083, the 57th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:15 UTC First seen by agentprime
  2. 31 Oct 2026, 14:15 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.