CVE-2026-43642: Deserialization of Untrusted Data in Softaculous Virtualizor
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.
AI Analysis
Technical Summary
Softaculous Virtualizor versions prior to 3.2.9 (Patch 9) and 3.0.0 contain a PHP object injection vulnerability in the billing module handler. Attackers can remotely and without authentication set the 'act' parameter to 'login' with 'from_billing_module' present, then supply malicious serialized PHP objects through the 'billing_data' POST field. The unserialize() function processes this data without allowed_classes restrictions, enabling exploitation of available POP chains to achieve remote code execution with root privileges.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary code as root on affected systems. This can lead to full system compromise, data theft, service disruption, and further lateral movement within the environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the billing module handler and monitor for suspicious POST requests with the 'billing_data' parameter. Avoid exposing the affected endpoints to untrusted networks.
CVE-2026-43642: Deserialization of Untrusted Data in Softaculous Virtualizor
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.
CVSS v4.0
Score 9.2critical
Affected software
Softaculous
Virtualizor
pkg:composer/softaculous/virtualizorRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Softaculous Virtualizor versions prior to 3.2.9 (Patch 9) and 3.0.0 contain a PHP object injection vulnerability in the billing module handler. Attackers can remotely and without authentication set the 'act' parameter to 'login' with 'from_billing_module' present, then supply malicious serialized PHP objects through the 'billing_data' POST field. The unserialize() function processes this data without allowed_classes restrictions, enabling exploitation of available POP chains to achieve remote code execution with root privileges.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary code as root on affected systems. This can lead to full system compromise, data theft, service disruption, and further lateral movement within the environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the billing module handler and monitor for suspicious POST requests with the 'billing_data' parameter. Avoid exposing the affected endpoints to untrusted networks.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-01T18:22:45.643Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab2c2eef7a7c541068b81cd
Added to database: 09/22/2026, 18:03:26 UTC
Last enriched: 09/22/2026, 18:18:59 UTC
Last updated: 09/23/2026, 01:58:06 UTC
Views: 10
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