Vulnerability Details CVE-2026-39366
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.7%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-39366
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cpe:2.3:a:wwbn:avideo:10.1
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cpe:2.3:a:wwbn:avideo:10.2
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cpe:2.3:a:wwbn:avideo:10.4
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cpe:2.3:a:wwbn:avideo:10.8
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cpe:2.3:a:wwbn:avideo:11.1
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cpe:2.3:a:wwbn:avideo:11.1.1
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cpe:2.3:a:wwbn:avideo:11.5
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cpe:2.3:a:wwbn:avideo:11.6
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cpe:2.3:a:wwbn:avideo:12.4
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cpe:2.3:a:wwbn:avideo:14.2
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cpe:2.3:a:wwbn:avideo:14.3
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cpe:2.3:a:wwbn:avideo:14.3.1
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cpe:2.3:a:wwbn:avideo:14.4
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cpe:2.3:a:wwbn:avideo:2.2
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cpe:2.3:a:wwbn:avideo:2.4
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cpe:2.3:a:wwbn:avideo:2.7
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cpe:2.3:a:wwbn:avideo:3.4
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cpe:2.3:a:wwbn:avideo:3.4.1
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cpe:2.3:a:wwbn:avideo:4.0
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cpe:2.3:a:wwbn:avideo:4.0.1
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cpe:2.3:a:wwbn:avideo:4.0.2
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cpe:2.3:a:wwbn:avideo:5.0
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cpe:2.3:a:wwbn:avideo:6.5
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cpe:2.3:a:wwbn:avideo:7.2
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cpe:2.3:a:wwbn:avideo:7.3
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cpe:2.3:a:wwbn:avideo:7.4
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cpe:2.3:a:wwbn:avideo:7.5
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cpe:2.3:a:wwbn:avideo:7.6
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cpe:2.3:a:wwbn:avideo:7.7
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cpe:2.3:a:wwbn:avideo:7.8
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cpe:2.3:a:wwbn:avideo:8.1
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cpe:2.3:a:wwbn:avideo:8.5
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cpe:2.3:a:wwbn:avideo:8.6
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cpe:2.3:a:wwbn:avideo:8.7
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cpe:2.3:a:wwbn:avideo:8.9
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cpe:2.3:a:wwbn:avideo:8.9.1