Authorization Bypass Through User-Controlled Key

Overview alextselegidis/easyappointments is a powerful Open Source Appointment Scheduler that can be installed on your server. Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the oauthcallback process. An attacker can access and modify anoth...

PYSEC-2026-2476 FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities

Summary While testing the GitHubProvider OAuth integration, which allows authentication to a FastMCP MCP server via a FastMCP OAuthProxy using GitHub OAuth, it was discovered that the FastMCP OAuthProxy does not properly validate the user's consent upon receiving the authorization code from GitHu...

CVE-2026-12597

Summary (CVE-2026-12597) : The LoginPress Pro WordPress plugin (versions up to and including 6.2.3) contains an authentication bypass via the GitHub OAuth callback. The flaw resides in the loginpress_on_github_login() function, which blindly trusts the first element (profile[0]['email']) from Git...

PYSEC-2026-1491 Khoj has an IDOR in Notion OAuth Flow that Enables Index Poisoning

Summary An IDOR in the Notion OAuth callback allows an attacker to hijack any user's Notion integration by manipulating the state parameter. The callback endpoint accepts any user UUID without verifying the OAuth flow was initiated by that user, allowing attackers to replace victims' Notion...

PYSEC-2026-1364 FastMCP vulnerable to reflected XSS in client's callback page

Summary While setting up an oauth client, it was noticed that the callback page hosted by the client during the flow embeds user-controlled content without escaping or sanitizing it. This leads to a reflected Cross-Site-Scripting vulnerability. Details The affected code is located in...

CVE-2026-58422 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts

Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts...

EUVD-2026-40143

Mixpost through 2.6.0 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in authenticated users' browsers by crafting malicious OAuth callback URLs with unsanitized error query parameters. Attackers can exploit the OAuth...

CVE-2026-13543 Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication

A vulnerability was detected in Documenso up to 2.11.0. Affected by this vulnerability is an unknown functionality of the file packages/auth/server/lib/utils/handle-oauth-callback-url.ts of the component Google OAuth Login. The manipulation results in improper authentication. It is possible to...

CVE-2026-13543 Documenso Google OAuth Login handle-oauth-callback-url.ts improper authentication

A vulnerability was detected in Documenso up to 2.11.0. Affected by this vulnerability is an unknown functionality of the file packages/auth/server/lib/utils/handle-oauth-callback-url.ts of the component Google OAuth Login. The manipulation results in improper authentication. It is possible to...

EUVD-2026-33960

NamelessMC is website software for Minecraft servers. In versions 2.2.4 and prior, the OAuth callback handling does not validate the state parameter server-side before exchanging the authorization code. This allows an attacker to capture a valid OAuth callback URL for their own account and cause ...

gitea -- multiple vulnerabilities

The Gitea team reports: CVE-2026-27783: incorrect read permission check CVE-2026-25714: public-only token filtering bypass CVE-2026-20706: missing token scope checking CVE-2026-27771: unauthenticated access to private container images CVE-2026-28744: git smart HTTP request scope bug CVE-2026-2869...

GHSA-WXW3-Q3M9-C3JR Better Auth: OAuth callback accepts mismatched `state` when cookie-backed state storage is used without PKCE

Am I affected? Users are affected if all of the following are true: - The application uses better-auth at a version below 1.6.2 or @better-auth/sso paired with such a version. - betterAuth account: storeStateStrategy is set to "cookie". The default "database" is not affected. - The application...

CVE-2026-40302 zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template which performs no HTML escaping instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the...

CVE-2026-40302 zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template which performs no HTML escaping instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the...

CVE-2026-40302 zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template which performs no HTML escaping instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the...

GHSA-4FXQ-2X3X-6XQX zrok: Reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering

Summary The proxyUi template engine uses Go's text/template which performs no HTML escaping instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the attacker-controlled refreshInterval query parameter verbatim into an error message when...

CVE-2026-34721 Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4...

CVE-2026-34721 Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4...

Zammad 跨站请求伪造漏洞

Zammad is a ticketing management software developed by the German company Zammad. Versions of Zammad prior to 7.0.1 and 6.5.4 contained a cross-site request forgeing vulnerability. This vulnerability stemmed from the lack of validation of the CSRF status parameter in the OAuth callback endpoint,...

CVE-2026-34969 Nhost Leaks the Refresh Token via URL Query Parameter in OAuth Provider Callback

Nhost is an open source Firebase alternative with GraphQL. Prior to 0.48.0, the auth service's OAuth provider callback flow places the refresh token directly into the redirect URL as a query parameter. Refresh tokens in URLs are logged in browser history, server access logs, HTTP Referer headers,...