{"cve":"CVE-2023-47090","nvd":{"published":"2023-10-30T17:15:52.467","modified":"2026-06-17T06:32:07.110","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5},"cwes":["CWE-863"],"references":["http://www.openwall.com/lists/oss-security/2023/10/30/1","https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23","https://www.openwall.com/lists/oss-security/2023/10/13/2","http://www.openwall.com/lists/oss-security/2023/10/30/1","https://github.com/nats-io/nats-server/security/advisories/GHSA-fr2g-9hjm-wr23"],"products":["linuxfoundation:nats-server"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-47090","score":0.00825,"percentile":0.57409,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-fr2g-9hjm-wr23","url":"https://osv.dev/vulnerability/GHSA-fr2g-9hjm-wr23","summary":"NATS.io: Adding accounts for just the system account adds auth bypass","modified":"2026-09-10T03:50:03.627050215Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.2.0 <2.9.23"],"fixed":["2.9.23"]},{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.10.0 <2.10.2"],"fixed":["2.10.2"]}]},{"id":"GO-2023-2133","url":"https://osv.dev/vulnerability/GO-2023-2133","summary":"Authorization bypass in github.com/nats-io/nats-server/v2","modified":"2026-02-04T04:13:50.715588Z","packages":[{"ecosystem":"Go","name":"github.com/nats-io/nats-server/v2","purl":"pkg:golang/github.com/nats-io/nats-server/v2","ranges":[">=2.2.0 <2.9.23",">=2.10.0 <2.10.2"],"fixed":["2.9.23","2.10.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}