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.

Published 2026-04-07 · last modified 2026-07-24.

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.

EPSS exploit prediction

EPSS: 0.002 (7.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Wwbn Avideo — versions <= 26.0

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

github.com/WWBN/AVideo/security/advisories/GHSA-mmw7-wq3c-wf9p (Third Party Advisory)
github.com/WWBN/AVideo/commit/8f53e9d9c6aaa07d51ace30691981edbbfb5ca1c (Patch)

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.