🛡️ Sentinel: [CRITICAL] Fix authorization bypass in file deletion endpoint

[xb1g]

🚨 Severity: CRITICAL
💡 Vulnerability: Insecure Direct Object Reference (IDOR) via path manipulation in the DELETE /api/upload endpoint. The code used fileName.includes(\submissions/${user.id}/`)to verify ownership, allowing an attacker to bypass authorization if their user ID appeared anywhere within a maliciously crafted file path. 🎯 Impact: Attackers could delete files belonging to other users if they correctly constructed a payload to bypass the.includescheck. 🔧 Fix: Changed.includesto.startsWithto strictly verify that the path begins with the authorized user's directory. ✅ Verification:pnpm testandpnpm lint` passed cleanly. Verified the logic mathematically guarantees strict prefix matching.

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PR created automatically by Jules for task 3678801344530333967 started by @xb1g

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Project	Deployment	Actions	Updated (UTC)
pseed	Ready	Preview, Comment	Mar 29, 2026 3:57am

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Pull request overview

This PR fixes an authorization bypass (IDOR via path manipulation) in the DELETE /api/upload endpoint by tightening the ownership check from a substring match to a strict prefix match, ensuring a user can only delete objects stored under their own submissions/<userId>/... keyspace.

Changes:

• Replaced fileName.includes(...) with fileName.startsWith(...) for strict ownership validation on delete.
• Prevents crafted keys that merely contain submissions/<userId>/ from passing authorization.

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	web	bb14073	May 11 2026, 06:27 PM