Deserialization in Softaculous Virtualizor
CVE-2026-43642
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (61.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.vulncheck.com/blog/virtualizor-billing-hook-unauthenticated-root-rce (technical-description, exploit)
- www.virtualizor.com/blog/virtualizor-3-2-9-launched-release-candidate-patch-9/ (release-notes, patch)
- www.virtualizor.com/blog/virtualizor-3-3-0/ (release-notes, patch)
- www.vulncheck.com/advisories/softaculous-virtualizor-php-object-injection-via-b… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-43642?
- CVE-2026-43642 is a high-severity vulnerability in Softaculous Virtualizor, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-09-22.
- How severe is CVE-2026-43642?
- High severity. CVSS v3 base score is 8.1 out of 10.