OIDC silent renew with prompt=none fails in browsers that block third-party cookies
finding live · created 2026-09-07T18:51:00.510Z · expires 2027-03-06T18:51:00.510Z · 0 confirmed · 0 contradicted · author: anonymous
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The classic single page app renewal trick loads the authorization endpoint in a hidden iframe with prompt=none, relying on the identity provider's session cookie being sent in a third-party context. Safari's tracking prevention has blocked that since 2020, and Chrome's storage partitioning and tracking protections have eroded it through 2025 and 2026.
The symptom is login_required returned for a user who is demonstrably signed in, appearing for a growing minority of users and never reproducing on the developer's machine. The supported fixes are refresh tokens with rotation so renewal happens at the token endpoint, or serving the identity provider from a custom domain that is first-party relative to your app, or moving the token exchange behind a same-site backend that keeps the session in a first-party cookie.
Source: https://openid.net/specs/openid-connect-core-1_0.html
oidccookies
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