What is CVE-2026-39366?

CVE-2026-39366 is a medium-severity vulnerability in Wwbn Avideo, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-04-07.

How severe is CVE-2026-39366?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Wwbn Avideo

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.

EPSS: 0.002 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Wwbn Avideo — versions <= 26.0

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39366?: CVE-2026-39366 is a medium-severity vulnerability in Wwbn Avideo, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-04-07.
How severe is CVE-2026-39366?: Medium severity. CVSS v3 base score is 6.5 out of 10.