CVE-2026-39366 WWBN AVideo Affected by a PayPal IPN Replay Attack Enabling Wallet Balance Inflation via Missing Transaction Deduplication in ipn.php
Attackers can replay PayPal IPN notifications to inflate wallet balances and renew subscriptions due to missing transaction deduplication in the v1 handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39366?
CVE-2026-39366 is a medium-severity vulnerability in Wwbn Avideo, published on 7 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
WWBN AVideo is an open source video platform. In versions 26.0 and prior, the PayPal IPN v1 handler at plugin/PayPalYPT/ipn.php lacks transaction deduplication, allowing an attacker to replay a single legitimate IPN notification to repeatedly inflate their wallet balance and renew subscriptions. The newer ipnV2.php and webhook.php handlers correctly deduplicate via PayPalYPT_log entries, but the v1 handler was never updated and remains actively referenced as the notify_url for billing plans.
Weakness: CWE-345
Which versions are affected by CVE-2026-39366?
2 open source packages ship an affected version, including wwbn/avideo. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
wwbn/avideo Packagist | All versions to 26.0 | None |
wwbn/avideo Packagist | All versions to 26.0 | None |
Products include Wwbn Avideo.
How do I fix CVE-2026-39366?
No fix has been published for CVE-2026-39366 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-39366 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39366 exists.
Other vulnerabilities in Wwbn Avideo
- CVE-2026-40911 WWBN AVideo YPTSocket WebSocket Broadcast Relay Leads to Unauthenticated Cross-User JavaScript Execution via Client-Side eval() Sinks
- CVE-2026-33478 AVideo Multi-Chain Attack: Unauthenticated Remote Code Execution via Clone Key Disclosure, Database Dump, and Command Injection
- CVE-2022-30534 Command injection in AVideo
- CVE-2022-30547 Path traversal in AVideo
- CVE-2022-32572 Command injection in AVideo
Sources
Also known as GHSA-mmw7-wq3c-wf9p.