MCP OAuth Cloudflare
Add OAuth authentication to MCP servers on Cloudflare Workers. Uses @cloudflare/workers-oauth-provider with Google OAuth for Claude.ai-compatible authentication. Prevents 9 documented errors including RFC 8707 audience bugs, Claude.ai connection failures, and CSRF vulnerabilities. Use when building MCP servers that need user authentication, implementing Dynamic Client Registration (DCR) for Claude.ai, or replacing static auth tokens with OAuth flows. Includes workarounds for production redirect URI mismatches and re-auth loop issues.
Security
1 medium severity finding. This skill can be installed but you should review these findings before use.
W011: Third-party content exposure detected (indirect prompt injection risk)
What this means
The skill exposes the agent to untrusted, user-generated content from public third-party sources, creating a risk of indirect prompt injection. This includes browsing arbitrary URLs, reading social media posts or forum comments, and analyzing content from unknown websites.
Why it was flagged
Third-party content exposure detected (high risk: 0.70). The skill explicitly fetches tokens and user profile data from public Google OAuth endpoints (e.g., https://oauth2.googleapis.com/token and https://www.googleapis.com/oauth2/v2/userinfo) and injects those untrusted user-derived props (email, name, picture, accessToken, etc.) into MCP tool handlers via this.props, so third‑party/user content can materially influence agent behavior.
- Repository
- jezweb/claude-skills
- Commit
fa91c34
- Audited
- Security analysis
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