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CVE-2026-66447 – Unauthenticated SQL Injection – WordPress File Upload plugin <= 5.1.7

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Summary

CVE-2026-66447 is an unauthenticated SQL injection vulnerability in the WordPress File Upload plugin for WordPress. Affecting all versions up to and including 5.1.7, it allows a remote, unauthenticated attacker to inject arbitrary SQL through the plugin. It is rated Critical with a CVSS v3.1 base score of 9.3.

Technical details

  • Root cause: Improper neutralization of special elements used in an SQL command (CWE-89), allowing attacker-controlled input to reach a database query without sufficient sanitization.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable code path is reachable by an unauthenticated remote attacker.
  • Attack vector: Network — the plugin is exploitable remotely over HTTP(S) against an internet-exposed WordPress site running the affected plugin.
  • Impact: Blind SQL injection enabling unauthorized access to database contents (High confidentiality impact) and limited availability impact; the scope is changed, meaning the affected component can impact resources beyond its own security scope.

Affected software

  • WordPress File Upload plugin (wp-file-upload) versions <= 5.1.7.

Severity

  • CVSS v3.1 base score: 9.3 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Update the WordPress File Upload plugin to version 5.1.8 or later, which addresses this vulnerability.
  • If no patch can be applied: Deactivate and remove the plugin until it can be updated, and restrict network access to the affected WordPress site. Employ a web application firewall to filter SQL injection attempts against the plugin’s endpoints as an interim measure.

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/wp-file-upload/

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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