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Lax Cookie Not Sent in iFrame on 302 Redirection

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I’m building an Angular application that is using OAuth2 Auth Code w/PKCE. The app uses hidden iframes to silently renew access tokens. I found that when the OAuth2 authorization serve redirects the iFrame to {parent origin}/silent-refresh.html with a 302, Firefox does not send any cookies set with SameSite: Lax.

SameSite: None cookies are sent as expected.

I compared this with IE and Chrome and both of those browser send the Lax cookies on when redirecting due to a 302.

This problem seems to only occur when the iFrame is being redirected via 302 from a different origin. I.e requests from a basic iFrame to the parent page origin send Lax cookies with no problem.

Anyone experience this? Is this expected behavior for Firefox?

Firefox Version 68.8

Alle svar (3)

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Does this also happen in current Firefox releases (current is 78.0.1) ?

There were some changes in Firefox 69.

Nyttig?

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I’m working on getting a new version. My corporate version of Firefox comes bundled with some MFA software. So it hasn’t been as easy as just downloading the latest and retesting.

Nyttig?

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Okay I was able to test this with 78.0.1 (64-bit) and the behavior is the same.

Nyttig?

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