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Virtualizor CVE-2026-43642: Remote Code Execution

Virtualizor is affected by 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. Affected versions: before 3.2.9 (Patch 9). Fixed in 3.2.9 (Patch 9). CVSS base score: 8.1.

High 8.1 CVSS
Virtualizor AlmaLinux 8 AlmaLinux 9 Debian 12 Ubuntu 22.04

Affected Versions

before 3.2.9 (Patch 9)

Patched Version

3.2.9 (Patch 9)

Default Update CMD

yum update virtualizor

Fix Commands

AlmaLinux / CloudLinux / Rocky Linux

yum update virtualizor
# Or in the admin panel: Config → Check for Updates → Update Now

What this means under a SharedLicense license

Your SharedLicense Virtualizor license itself is not affected — this is a vulnerability in Virtualizor, not in licensing. Licenses continue to work during and after the update; there is no need to re-issue or re-activate anything. If you resell under your own brand, patch client servers too — unpatched installs put your reputation at risk, not your license.

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.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-43642

Frequently Asked Questions

What is 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. Affected versions: before 3.2.9 (Patch 9). Fixed in 3.2.9 (Patch 9).
Is CVE-2026-43642 being exploited in the wild?
No confirmed public exploitation has been announced at the time of writing. With a CVSS base score of 8.1, apply the update on your next maintenance window and watch the vendor advisory for changes.
How do I fix CVE-2026-43642?
yum update virtualizor. Or in the admin panel: Config → Check for Updates → Update Now.
Which versions are affected?
Affected: before 3.2.9 (Patch 9). Update to 3.2.9 (Patch 9) or later.

References

Security Advisories

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