CVE-2026-33731 AVideo has an Authorize.Net Webhook Signature Bypass that Enables Wallet Balance Inflation via Forged Payment Data

What is CVE-2026-33731?

CVE-2026-33731 is a medium-severity vulnerability in WWBN AVideo, published on 16 Jul 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 prior to 29.0, the Authorize.Net webhook handler at plugin/AuthorizeNet/webhook.php contains a signature verification bypass that allows an attacker to forge webhook requests with arbitrary payment amounts and target user IDs. By supplying a valid transaction ID from a small legitimate purchase, the attacker bypasses signature validation and credits arbitrary wallet balances to any user account via attacker-controlled payload fields. Three flaws combine into an exploit chain: signature bypass via OR logic (webhook.php:33), payload values override API-fetched values (AuthorizeNet.php:169-171, webhook.php:44-48) and a missing approval check (webhook.php:61-75). By forging payment metadata, an attacker can credit arbitrary amounts to any user's wallet without a corresponding payment and include a  plans_id  to activate premium subscriptions (webhook.php:86-134), enabling free access to all paid and premium content and causing direct revenue loss to the platform owner. This issue has been fixed in version 29.0.

Weakness: CWE-345

Which versions are affected by CVE-2026-33731?

2 open source packages ship an affected version, including wwbn/avideo.

How do I fix CVE-2026-33731?

Upgrade wwbn/avideo to 29.0 or later.

Is CVE-2026-33731 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33731 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-95jh-7r58-xmxw.