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zitadel/apps
604d5cb0a9 fix(login): prevent duplicate email-code verification issue (#11893)
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# Which Problems Are Solved

- With Login V2 and EMAIL_VERIFICATION=true, opening the verify page
with send=true can trigger email code generation twice.
- The second code invalidates the first one, so users may receive two
emails where the first code is always invalid.
- This causes failed verification attempts and blocks onboarding for
affected users.

# How the Problems Are Solved

- Removed side-effectful email-code sending from direct server component
execution path.
- Ensured code sending is executed only once in a safe server-side flow,
so React Server Component re-fetches do not generate additional codes.
- Kept verify flow behavior intact while preventing duplicate code
invalidation.

# Additional Changes

- Added/updated logic around the verify flow to make repeated
render/re-fetch paths idempotent for email-code sending.
- Improved reliability of the Login V2 email verification step under App
Router navigation behavior.

# Additional Context

Fixes #11857
- Tested manually with Login V2 and EMAIL_VERIFICATION=true by
completing a new user registration flow to /verify?send=true.
- Verified that only one verification email is sent and the first
received code is valid (no duplicate invalidating code generated).
Related bug report with reproduction details:
[https://github.com/zitadel/zitadel/issues/11857](vscode-file://vscode-app/Applications/Visual%20Studio%20Code.app/Contents/Resources/app/out/vs/code/electron-browser/workbench/workbench.html)

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Co-authored-by: Max Peintner <[email protected]>
2026-03-31 12:04:28 +00:00
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