Hey everyone, I’m looking to improve our security posture, and part of that means that we need to avoid using secret credentials whenever we can. Unfortunately the OIDC plugin required a client secret credential to hit the /userinfo endpoint, and I couldn’t set up my forum with it enabled. Fortun…

I think what you’re describing here is the OpenID Connect “Implicit Flow” , which works without any server->server communication, and therefore doesn’t need a shared secret. Instead, all information is transmitted via the HTTP redirects, and the ID token is cryptographically verified using the public…

Also worth noting that the OIDC “Implicit Flow” does increase the surface area for CSRF attacks and token exposure: [image] Implicit flow vs. Authorization code flow: Why implicit flow is dead? · Logto... Why is there an "Authorization code flow" in OAuth 2.0 when we already have the "I…

Thank you for the detailed reply! I think it can still make sense for some situations. But it seems like the Authorization Code flow (Discourse’s default) with PKCE (optional in Discourse) is the most-recommended way to use OIDC. This is very interesting - I didn’t fully grasp PKCE until now. Ba…

Okay - this works with the following configuration: "DISCOURSE_OPENID_CONNECT_ENABLED": "true", "DISCOURSE_OPENID_CONNECT_DISCOVERY_DOCUMENT": "https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration", "DISCOURSE_OPENID_CONNECT_CLIENT_ID": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx…

Thanks for this @justinm . I’ve merged the PR, and added a section to the docs: [image] Discourse OpenID Connect (OIDC) For identity providers which support secret-less authorization using the “Authorization Code Flow with Proof Key for Code Exchange” , PKCE should be enabled, and the client_secre…

Refactorisation du plugin OpenID Connect

Dev

david (David Taylor) Janvier 16, 2026, 1:29 6

Merci pour cela @justinm. J’ai fusionné la PR et ajouté une section à la documentation :

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Refactorisation du plugin OpenID Connect

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