{"id":"CVE-2026-41213","revision":"4c2102c5e1864537a185744485260075","records":[{"revision":"4c2102c5e1864537a185744485260075","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41213","aliases":[],"title":"@node-oauth/oauth2-server: PKCE code_verifier ABNF not enforced in token exchange allows brute-force redemption of intercepted authorization codes","description":"@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js. The token exchange path accepts RFC7636-invalid code_verifier values (including one-character strings) for S256 PKCE flows. Because short/weak verifiers are accepted and failed verifier attempts do not consume the authorization code, an attacker who intercepts an authorization code can brute-force code_verifier guesses online until token issuance succeeds.","state":0,"publishedAt":"2026-04-23T18:33:42.365+00:00","modifiedAt":"2026-04-25T01:23:58.715+00:00","affected":[{"ecosystem":"Vendor product","name":"node-oauth2-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"node-oauth\",\n                    \"product\": \"node-oauth2-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/node-oauth/node-oauth2-server/security/advisories/GHSA-jhm7-29pj-4xvf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-41213","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-41213","identifiers":["CVE-2026-41213"]},"retained":false,"historicalAffected":[]}],"coverage":[]}