[Backend] Any user can submit another user's pending remittance

[ogazboiz]

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Description

The ownership check compares a value to itself rather than to the authenticated sender, so a pending remittance can be submitted by anyone.

Component: Backend
Location: backend/src/controllers/remittanceController.ts -> submitRemittanceTransaction
Severity: Critical

How to reproduce / find it

Submit a pending remittance created by a different user.

Expected behavior

Only the remittance's sender should be able to submit it.

Notes for contributors

This is a logic/behavior defect, not a compile error. Please open one PR per fix that references this issue and names the file and function above.

[raizo07]

@raizo07 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, kindly assign this issue to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @raizo07 to this issue.

[T-kesh]

@T-kesh has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Kindly assign me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @T-kesh to this issue.

[drips-wave]

Congratulations, @T-kesh! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @T-kesh: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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