W2-F-034 - OAuth callback redirect target read from `sessionStorage` unvalidated

[likableai]

Severity: Medium | Area: frontend/auth | Evidence: app/auth/oauth/callback/page.tsx:38-40 — returnPath = sessionStorage.getItem('oauth_return_path') || '/' then router.replace(returnPath)
Impact: Any code that can write sessionStorage controls post-login navigation (internal redirect abuse). Fix: Validate the path starts with / and is not ///protocol-relative. Acceptance: External/evil return paths are rejected.

[meetdarc-tech]

@meetdarc-tech has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello Maintainer, i'm an experienced full stack dev and i will like to work on this issue.
if you'll kindly assign, the issue will be resolved.
ETA: 5 Hours

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[nede110]

@nede110 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer I will like to work on this issue please

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[drips-wave]

Congratulations, @meetdarc-tech! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@meetdarc-tech's PR #840 was approved and merged by @Junman140.

🏆 @meetdarc-tech: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (83 total points). Track your full progress on GrantFox.

👏 Great work, @meetdarc-tech! Keep contributing to Pi-Defi-world.

[drips-wave]

This issue has been completed by @meetdarc-tech as part of the Stellar Wave Program's 8th Wave 🥳

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