CVE-2026-43642

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-22. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.1
EG Score
8.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 22, 2026

Advisory Details (4)

Auto-updated Sep 22, 2026
No patch confirmed yet.
generic

Softaculous Virtualizor PHP Object Injection via Billing Module Handler | Advisories | VulnCheck

https://www.vulncheck.com/advisories/softaculous-virtualizor-php-object-injection-via-billing-module-handler
generic

Virtualizor 3.3.0 – Virtualizor

https://www.virtualizor.com/blog/virtualizor-3-3-0/
generic

Virtualizor 3.2.9 Launched (Patch 9) – Virtualizor

https://www.virtualizor.com/blog/virtualizor-3-2-9-launched-release-candidate-patch-9/
generic

Virtualizor: The Login Parameter That Skips the Login | Blog | VulnCheck

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

Vendor Advisories for CVE-2026-43642(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-23 19:06 UTCEG score recompute
  2. 2026-09-23 19:06 UTCGHSA enrichment
  3. 2026-09-23 17:53 UTCEPSS rescore
  4. 2026-09-23 07:41 UTCGHSA enrichment
  5. 2026-09-22 20:52 UTCEG score recompute
  6. 2026-09-22 20:52 UTCGHSA enrichment
  7. 2026-09-22 18:31 UTCEG score recompute
  8. 2026-09-22 17:58 UTCEG score recompute
  9. 2026-09-22 17:58 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43642?
CVE-2026-43642 is a high vulnerability published on September 22, 2026. 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…
When was CVE-2026-43642 disclosed?
CVE-2026-43642 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43642 actively exploited?
CVE-2026-43642 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 39.9% of all scored CVEs.
What is the CVSS score of CVE-2026-43642?
CVE-2026-43642 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-43642?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43642, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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