{"id":"CVE-2026-92087","summary":"@fastify/auth vulnerable to Authorization Bypass via order-dependent evaluation of composed auth","details":"@fastify/auth is a Fastify plugin that composes multiple authentication and authorization strategies into a single route guard. In versions 5.0.0 through 5.1.0, when strategies are composed with the relation \"or\" option together with the run \"all\" option and one entry is a nested array acting as an AND group, the group is evaluated in an order-dependent way: an earlier failing check is silently dropped and the group's result becomes the outcome of its last check. As a result, a request that satisfies only the last member of an AND group, for example an attacker who holds a valid API key but is not an administrator, is authorized instead of rejected, and a related order-dependent bypass affects the mirror configuration where the top-level relation is \"and\" and a nested group uses \"or\". The issue is fixed in @fastify/auth 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, omit the run \"all\" option where it is not required, order each AND group so its stricter check is evaluated last, or replace nested AND groups with an explicit top-level \"and\" composition.","aliases":["GHSA-7h52-2rwr-m76r"],"modified":"2026-09-19T03:30:50.296353821Z","published":"2026-09-16T14:21:23.686Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92087.json","cna_assigner":"openjs","cwe_ids":["CWE-285","CWE-697"]},"references":[{"type":"ADVISORY","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92087.json"},{"type":"ADVISORY","url":"https://github.com/fastify/fastify-auth/security/advisories/GHSA-7h52-2rwr-m76r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92087"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fastify/fastify-auth","events":[{"introduced":"7ea2f757470405280a5374ae39cb65eca0fb64e7"},{"fixed":"1b60c1df1f1742d1e93861de77474161023b1b8b"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"5.0.0"},{"fixed":"5.1.1"},{"fixed":"5.1.0"}]}}],"versions":["v5.1.0","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v5.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92087.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}