Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains an authorization bypass vulnerability in the billing module handler that allows unauthenticated remote attackers to modify any tenant's account balance by supplying crafted act and frombillingmodule parameters to the admin panel dispatcher. Attackers can send a POST request with arbitrary uid and balance values in the billingdata field to trigger an unauthenticated parameterized UPDATE against the users table, enabling account balance manipulation and potential automated service suspension for targeted accounts.

Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains a PHP object injection vulnerability in the billing module handler that allows unauthenticated remote attackers to supply arbitrary serialized PHP objects for deserialization by setting the act parameter to login with the frombillingmodule parameter present. Attackers can pass malicious serialized data through the billingdata POST field to the unserialize() function without allowedclasses restrictions, enabling exploitation of available POP chains to achieve remote code execution as root.

Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains an OS command injection vulnerability in the billing module handler that allows unauthenticated remote attackers to execute arbitrary commands as root by bypassing authentication through specific parameter combinations. Attackers can deserialize a crafted billingdata POST field and inject shell payloads through the uid field, which is passed unmodified to procopen() via vexec(), yielding complete control of the host and all managed VPS instances.

The WHMCS Reseller Module V2 2.0.2 in Softaculous Virtualizor before 2.9.1.0 does not verify the user correctly, which allows remote authenticated users to control other virtual machines managed by Virtualizor by accessing a modified URL.