CVE-2026-42235

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted clientname. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that...

CVE-2026-42235

CVE-2026-42235 affects the n8n open-source workflow automation platform. An unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user approves the OAuth consent and another user later revokes that access, a toast renders the injected script,...

CVE-2026-42235

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted clientname. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that...

EUVD-2026-27110

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted clientname. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that...

n8n Vulnerable to XSS via MCP OAuth client

Impact An unauthenticated attacker could register a malicious MCP OAuth client with a crafted clientname. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute...

GHSA-537J-GQPC-P7FQ n8n Vulnerable to XSS via MCP OAuth client

Impact An unauthenticated attacker could register a malicious MCP OAuth client with a crafted clientname. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute...

PT-2026-36905

Name of the Vulnerable Software and Affected Versions n8n versions prior to 1.123.32 n8n versions prior to 2.17.4 n8n versions prior to 2.18.1 Description An unauthenticated attacker can register a malicious MCP OAuth client using a crafted client name. If a victim user authorizes the OAuth conse...

CVE-2026-3530

A flaw was found in the Drupal OpenID Connect / OAuth client. This Server-Side Request Forgery SSRF vulnerability allows a remote attacker to trick the server into making unauthorized requests to internal or external resources. This could lead to the disclosure of sensitive information or enable...

FastMCP Auth Integration Allows for Confused Deputy Account Takeover

Summary FastMCP documentation covers the scenario where it is possible to use Entra ID or other providers for authentication. In this context, because Entra ID does not support Dynamic Client Registration DCR, the FastMCP-hosted MCP server is acting as the authorization provider, as declared in t...

GHSA-C2JP-C369-7PVX FastMCP Auth Integration Allows for Confused Deputy Account Takeover

Summary FastMCP documentation covers the scenario where it is possible to use Entra ID or other providers for authentication. In this context, because Entra ID does not support Dynamic Client Registration DCR, the FastMCP-hosted MCP server is acting as the authorization provider, as declared in t...

Linux Distros Unpatched Vulnerability : CVE-2021-39881

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In all versions of GitLab CE/EE since version 7.7, the application may let a malicious user create an OAuth client application with arbitrary scope names which...

CVE-2025-48475 FreeScout Vulnerable to Insufficient Authorization

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.180, the System does not provide a check on which "clients" of the System an authorized user can view and edit, and which ones they cannot. As a result, an authorized user who does not have access to any of the...

CVE-2023-2585

Keycloak's device authorization grant does not correctly validate the device code and client ID. An attacker client could abuse the missing validation to spoof a client consent request and trick an authorization admin into granting consent to a malicious OAuth client or possible unauthorized acce...

google-oauth-client: missing PKCE support in accordance with the RFC for OAuth 2.0 for Native Apps can lead to improper authorization

PKCE support is not implemented in accordance with the RFC for OAuth 2.0 for Native Apps. Without the use of PKCE, the authorization code returned by an authorization server is not enough to guarantee that the client that issued the initial authorization request is the one that will be authorized...

WordPress plugin OAuth client Single Sign On 跨站请求伪造漏洞

WordPress and WordPress plugin are both products of the WordPress Foundation.WordPress is a blogging platform developed using the PHP language. The platform supports setting up personal blog sites on servers with PHP and MySQL.WordPress plugin is an application plugin. A cross-site request forger...

CVE-2022-22969

Spring Security OAuth versions 2.5.x prior to 2.5.2 and older unsupported versions are susceptible to a Denial-of-Service DoS attack via the initiation of the Authorization Request in an OAuth 2.0 Client application. A malicious user or attacker can send multiple requests initiating the...

DEBIAN-CVE-2018-1000088

Doorkeeper version 2.1.0 through 4.2.5 contains a Cross Site Scripting XSS vulnerability in web view's OAuth app form, user authorization prompt web view that can result in Stored XSS on the OAuth Client's name will cause users interacting with it will execute payload. This attack appear to be...