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Vulnerability record · CVE-2026-43642 · published 22 September 2026

CVE-2026-43642: Deserialization of untrusted data vulnerability

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.

9.2 CVSS 4.0 Critical EPSS 0.96% · top 40.0% CWE-502 · Deserialization of untrusted data Deferred
9.2CVSS 4.0 base score
0.96%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
26 Sep 2026Last modified by NVD

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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.virtualizor.com/blog/virtualizor-3-2-9-launched-release-candidate-patch-9/
https://www.virtualizor.com/blog/virtualizor-3-3-0/
https://www.vulncheck.com/advisories/softaculous-virtualizor-php-object-injection-via-billing-module-handler
https://www.vulncheck.com/blog/virtualizor-billing-hook-unauthenticated-root-rce

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Source: NIST National Vulnerability Database (record CVE-2026-43642), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.