EUVD-2026-16734
GHSA-h54m-c522-h6qr
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3Description
WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `transferBalance()` method in `plugin/YPTWallet/YPTWallet.php` contains a Time-of-Check-Time-of-Use (TOCTOU) race condition. The method reads the sender's wallet balance, checks sufficiency in PHP, then writes the new balance - all without database transactions or row-level locking. An attacker with multiple authenticated sessions can send concurrent transfer requests that all read the same stale balance, each passing the balance check independently, resulting in only one deduction being applied while the recipient is credited multiple times. Commit 34132ad5159784bfc7ba0d7634bb5c79b769202d contains a fix.
Analysis
WWBN AVideo up to version 26.0 allows authenticated attackers to conduct concurrent balance transfers that exploit a Time-of-Check-Time-of-Use (TOCTOU) race condition in the wallet module, enabling arbitrary financial value multiplication without database transaction protection. An attacker with multiple authenticated sessions can trigger parallel transfer requests that each read the same wallet balance, all pass the sufficiency check independently, but result in only a single deduction while the recipient receives multiple credits. …
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Remediation
Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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