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Backport of #593 to release/2026.1. This PR combines two security fixes for the discourse-subscriptions plugin. ## Commits ### 1. `1ca9255da2` — SECURITY: Fix unauthorized group access via subscription finalize The `/s/finalize` endpoint accepted client-supplied `plan` and `transaction` parameters that determined which group a user would be added to after completing a Stripe payment. During the 3D Secure authentication flow, an authenticated user could complete a cheap subscription in `SubscribeController#create` but supply a premium plan ID when calling `#finalize`, granting themselves access to a higher-tier group they never paid for. This commit fixes the vulnerability by linking the two endpoints server-side using `server_session`. When `#create` produces a transaction requiring 3D Secure authentication (`incomplete` or `open` status), it stores the transaction ID and plan ID in the server session. `#finalize` then reads exclusively from the session instead of accepting client parameters, and clears the entry after successful finalization. On the frontend, `Transaction.finalize()` no longer sends any parameters to the server. (from #434) --- ### 2. `bc79b23e34` — SECURITY: Use per-request Stripe API key instead of global state Replace `set_api_key` (which mutated global `::Stripe.api_key`) with `set_stripe_api_key` (which stores the key in an instance variable). All Stripe API calls now receive `{ api_key: @stripe_api_key }` as the per-request opts parameter, following the stripe gem's documented per-request configuration pattern. This prevents API key leakage across concurrent requests in multi-threaded environments. (from #590) --- **Security Advisory:** https://github.com/discourse/discourse/security/advisories/GHSA-f866-8fcp-fgvv --- **Security Advisory:** https://github.com/discourse/discourse/security/advisories/GHSA-9vg5-mp49-xghh |
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