CVE-2017-18924

oauth2-server (aka node-oauth2-server) through 3.1.1 implements OAuth 2.0 without PKCE. It does not prevent authorization code injection. This is similar to CVE-2020-7692. NOTE: the vendor states 'As RFC7636 is an extension, I think the claim in the Readme of "RFC 6749 compliant" is valid and not misleading and I also therefore wouldn't describe this as a "vulnerability" with the library per se.

• CWE-94

• https://codeburst.io/missing-the-point-in-securing-oauth-2-0-83968708b467Third Party Advisory
• https://github.com/oauthjs/node-oauth2-server/issues/637Exploit, Third Party Advisory
• https://github.com/oauthjs/node-oauth2-server/pull/452Patch, Third Party Advisory
• https://tools.ietf.org/html/draft-ietf-oauth-security-topics-15Exploit, Third Party Advisory
• https://tools.ietf.org/html/rfc7636Third Party Advisory
• https://codeburst.io/missing-the-point-in-securing-oauth-2-0-83968708b467Third Party Advisory
• https://github.com/oauthjs/node-oauth2-server/issues/637Exploit, Third Party Advisory
• https://github.com/oauthjs/node-oauth2-server/pull/452Patch, Third Party Advisory
• https://tools.ietf.org/html/draft-ietf-oauth-security-topics-15Exploit, Third Party Advisory
• https://tools.ietf.org/html/rfc7636Third Party Advisory

Published

Oct 4, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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