feat(middleware): add CSRF protection [H11]#559
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lakhansamani merged 1 commit intomainfrom Apr 4, 2026
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X-CSRF-Token was listed in allowed CORS headers but never validated. Combined with Allow-Credentials: true and SameSite=None cookies, all POST mutations were CSRF-vulnerable. Adds middleware requiring Content-Type: application/json or X-Requested-With header on POST/PUT/DELETE/PATCH requests. Browsers cannot send these headers cross-origin without CORS preflight. OAuth callback and token routes are exempted (provider redirects, client credentials flow). Fixes: H11 (High)
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Summary
Test plan