Vvveb CMS CVE-2026-44826 Allows Negative Order Totals, Exposing Merchants to Financial Fraud

The National Vulnerability Database has disclosed CVE-2026-44826, a critical vulnerability in Vvveb CMS versions prior to 1.0.8.2. This flaw allows an unauthenticated attacker to manipulate the quantity parameter on the cart-add endpoint by submitting a negative integer. Instead of rejecting the input, Vvveb CMS processes it, carrying the negative sign through all downstream calculations, including line totals, subtotals, taxes, and the grand total.

The immediate impact is that the customer-facing cart displays a negative grand total, and the checkout process accepts this fraudulent order. Crucially, the order is then persisted in the merchant’s database with a negative total, effectively creating a record where the merchant owes the customer money. This isn’t just a display bug; it’s a direct financial risk, creating illegitimate transactions that can be exploited for fraud or financial manipulation against the merchant. The vulnerability is rated 7.5 (HIGH) on the CVSS scale.

Attackers can leverage this to generate refunds without returning goods, or to create a complex web of fake transactions that complicate financial reconciliation and potentially enable money laundering. This isn’t theoretical; it’s a fundamental breakdown in transaction integrity. Defenders running Vvveb CMS must prioritize patching to version 1.0.8.2 immediately to prevent exploitation and safeguard their financial operations.