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CVE-2026-66665 – Unauthenticated Arbitrary File Upload – Type Hub WordPress Plugin ≤ 2.0.6

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Summary

CVE-2026-66665 is an unauthenticated arbitrary file upload vulnerability in the Type Hub WordPress plugin (by Brandexponents) affecting all versions up to and including 2.0.6. Because unauthenticated attackers can upload files of dangerous types, the flaw can lead to full remote server compromise and carries a critical severity rating of 10.0.

Technical details

  • Root cause: Unrestricted upload of files with a dangerous type (CWE-434) — the plugin does not properly validate uploaded files.
  • Trigger conditions: No authentication or user interaction is required; an attacker can reach the vulnerable upload functionality directly.
  • Attack vector: Network — remotely exploitable with low attack complexity.
  • Impact: Attackers can upload executable files (e.g., a web shell), enabling arbitrary code execution with web server privileges and full compromise of confidentiality, integrity, and availability. The scope is changed, meaning impact can extend beyond the vulnerable component.

Affected software

  • Type Hub WordPress plugin (Brandexponents) — all versions up to and including 2.0.6.

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Type Hub plugin to a version newer than 2.0.6 as soon as a fixed release is available from the vendor.
  • If no patch is available: Deactivate and remove the Type Hub plugin. Restrict access to WordPress upload and plugin endpoints, and deploy a web application firewall rule to block unauthenticated file upload attempts and requests to the plugin’s paths.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw HTTP response body: /wp-content/plugins/typehub/

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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