CVE-2026-65594

n8n before 2.29.8 and 2.30.x before 2.30.1 affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger...

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-2026-27124

FastMCP is the standard framework for building MCP applications. Prior to version 3.2.0, 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...

ThreatsDay Bulletin: OAuth Trap, EDR Killer, Signal Phishing, Zombie ZIP, AI Platform Hack & More

Another Thursday, another pile of weird security stuff that somehow happened in just seven days. Some of it is clever. Some of it is lazy. A few bits fall into that uncomfortable category of “yeah… this is probably going to show up in real incidents sooner than we’d like.” The pattern this week...

Doorkeeper gem has stored XSS on authorization consent view

Stored XSS on the OAuth Client's name will cause users being prompted for consent via the "implicit" grant type to execute the XSS payload. The XSS attack could gain access to the user's active session, resulting in account compromise. Any user is susceptible if they click the authorization link...