CVE-2026-43642 Details
Description
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 from_billing_module parameter present. Attackers can pass malicious serialized data through the billing_data POST field to the unserialize() function without allowed_classes restrictions, enabling exploitation of available POP chains to achieve remote code execution as root.
A PHP object injection vulnerability has been identified in Softaculous Virtualizor versions prior to 3.2.9 (Patch 9) and 3.0.0. The vulnerability resides in the billing module handler, where unauthenticated remote attackers can send arbitrary serialized PHP objects for deserialization. This is achieved by setting the 'act' parameter to 'login' and including the 'from_billing_module' parameter. The malicious serialized data is transmitted through the 'billing_data' POST field to the 'unserialize()' function, without any restrictions on allowed classes. This lack of oversight enables attackers to exploit existing property-oriented programming chains, leading to remote code execution with root privileges.
Users are advised to update to Virtualizor version 3.2.9 (Patch 9) or 3.3.0, both of which address this vulnerability. After updating, ensure that the admin panel ports are not exposed to the public internet or are behind an allowlist.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 22, 2026CISA-ADP
Assessed Sep 25, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.virtualizor.com/blog/virtualizor-3-2-9-launched-release-candidate-patch-9/ | [email protected] | Release NotesVendor |
| https://www.virtualizor.com/blog/virtualizor-3-3-0/ | [email protected] | Release NotesVendor |
| https://www.vulncheck.com/advisories/softaculous-virtualizor-php-object-injection-via-billing-module-handler | [email protected] | Advisory |
| https://www.vulncheck.com/blog/virtualizor-billing-hook-unauthenticated-root-rce | [email protected] | BundleExploitRemedyTechnical Analysis |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Softaculous Virtualizor | < 3.2.9 (Patch 9) < 3.0.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 26, 2026 | CVE Modified | CISA-ADP |
| Sep 22, 2026 | New CVE Received | [email protected] |