CVE-2026-43641: Command Injection (CVSS 9.8)

Description

Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains an OS command injection vulnerability in the billing module handler that allows unauthenticated remote attackers to execute arbitrary commands as root by bypassing authentication through specific parameter combinations. Attackers can deserialize a crafted billing_data POST field and inject shell payloads through the uid field, which is passed unmodified to proc_open() via vexec(), yielding complete control of the host and all managed VPS instances.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0303

Probability of exploitation

0.87%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

References

Other References

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-os-command-injection-via-billing-module-handler https://www.vulncheck.com/blog/virtualizor-billing-hook-unauthenticated-root-rce

Frequently Asked Questions

What is CVE-2026-43641? +

Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains an OS command injection vulnerability in the billing module handler that allows unauthenticated remote attackers to execute arbitrary commands as root by bypassing authentication through specific parameter combinations. Attackers can deserialize a crafted billing_data POST field and inject shell payloads through the uid field, which is passed unmodified to proc_open() via vexec(), yielding complete control of the host and all managed VPS instances. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-43641? +

CVE-2026-43641 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0303, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-43641? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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