{"id":"CVE-2026-55638","aliases":["GHSA-8gmq-j984-vp4r"],"url":"https://o3.security/vulnerability/CVE-2026-55638","summary":"9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass","details":"9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/* to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/* to bypass the API-key gate and cause the server to make upstream provider calls using operator-stored LLM provider credentials. This issue is fixed in version 0.5.2.","published":"2026-07-10T15:38:21.922Z","modified":"2026-08-12T03:51:30.431628302Z","cvss":{"score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"9router","fixedVersion":"0.5.2"}],"fix":{"url":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3","label":"decolua/9router@b282f05"},"references":[{"type":"WEB","url":"https://github.com/decolua/9router/releases/tag/v0.5.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55638.json"},{"type":"ADVISORY","url":"https://github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55638"},{"type":"FIX","url":"https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:30.431628302Z"}}