{"id":82044,"date":"2026-07-15T20:48:09","date_gmt":"2026-07-15T17:18:09","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-53512-better-auth-oauth-refresh-token-replay-via-missing-client-authentication-on-oidc-provider-and-mcp-plugins\/"},"modified":"2026-07-15T20:48:09","modified_gmt":"2026-07-15T17:18:09","slug":"cve-2026-53512-better-auth-oauth-refresh-token-replay-via-missing-client-authentication-on-oidc-provider-and-mcp-plugins","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-53512-better-auth-oauth-refresh-token-replay-via-missing-client-authentication-on-oidc-provider-and-mcp-plugins\/","title":{"rendered":"CVE-2026-53512 &#8211; Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider and mcp plugins"},"content":{"rendered":"<p>CVE ID :CVE-2026-53512<\/p>\n<p>  Published : July 15, 2026, 5:18 p.m. | 16\u00a0minutes ago<\/p>\n<p>  Description :Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential client&#8217;s client_secret, allowing an attacker with a valid refresh_token to mint access tokens and rotated refresh tokens through \/api\/auth\/oauth2\/token or \/api\/auth\/mcp\/token. The @better-auth\/oauth-provider package is not affected. This issue is fixed in version 1.6.11.<\/p>\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-53512 Published : July 15, 2026, 5:18 p.m. | 16\u00a0minutes ago Description :Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82044","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82044"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82044\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}