CVE-2026-39366

| EUVD-2026-19878 MEDIUM
2026-04-07 GitHub_M GHSA-mmw7-wq3c-wf9p
6.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

3
EUVD ID Assigned
Apr 07, 2026 - 20:16 euvd
EUVD-2026-19878
Analysis Generated
Apr 07, 2026 - 20:16 vuln.today
CVE Published
Apr 07, 2026 - 19:21 nvd
MEDIUM 6.5

Tags

Information Disclosure PHP

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.

Analysis

Replay attack in WWBN AVideo versions 26.0 and prior allows authenticated attackers to repeatedly submit legitimate PayPal IPN notifications to the v1 handler, inflating wallet balances and renewing subscriptions without additional payment. The vulnerability exploits missing transaction deduplication in plugin/PayPalYPT/ipn.php, while newer v2 handlers correctly implement deduplication. …

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Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +32
POC: 0

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CVE-2026-39366 vulnerability details – vuln.today
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