WWBN AVideo up to 28.x Webhook webhook.php plans_id signature verification

Summaryinfo

A vulnerability labeled as critical has been found in WWBN AVideo up to 28.x. Impacted is an unknown function of the file plugin/AuthorizeNet/webhook.php of the component Webhook Handler. Executing a manipulation of the argument plans_id can lead to signature verification. This vulnerability appears as CVE-2026-33731. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in WWBN AVideo up to 28.x. This vulnerability affects an unknown part of the file plugin/AuthorizeNet/webhook.php of the component Webhook Handler. The manipulation of the argument plans_id with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33731 since 03/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

By approaching the search of inurl:plugin/AuthorizeNet/webhook.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 29.0 eliminates this vulnerability.

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Productinfo

Vendor

• WWBN

Name

• AVideo

Version

• 28.x

License

• open-source

Website

• Product: https://github.com/WWBN/AVideo/

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