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CVE-2026-9067 – Unauthenticated Arbitrary File Upload – Schema & Structured Data for WP & AMP < 1.60

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Summary

CVE-2026-9067 is a critical unauthenticated arbitrary file upload vulnerability affecting the Schema & Structured Data for WP & AMP WordPress plugin in all versions prior to 1.60. Rated CVSS 9.1 (Critical), the flaw allows any unauthenticated remote attacker to upload arbitrary file types through the plugin’s frontend AJAX file-upload handlers — endpoints that were intended to accept only images or videos. With over 100,000 active installations, this vulnerability represents a significant attack surface across the internet.

Technical details

  • Root cause: The plugin fails to enforce any user capability checks on its frontend AJAX file-upload handlers, and performs no validation of uploaded file content against the declared media type of the target endpoint (CWE-434: Unrestricted Upload of File with Dangerous Type).
  • Trigger conditions: An unauthenticated HTTP request carrying a crafted file payload sent to the affected AJAX endpoints is sufficient to trigger the vulnerability — no account, session, or user interaction is required.
  • Attack vector: Remote, over the network (AV:N). Exploitable by any internet user with no prerequisites (PR:N / UI:N / AC:L).
  • Impact: Attackers can place arbitrary files — including potentially malicious file types — into the WordPress media library. Depending on server configuration and the file types accepted by the WordPress installation, this can enable malicious content injection and, in certain server environments, create paths toward code execution. The CVSS impact scores reflect high confidentiality (C:H) and high integrity (I:H) impact.

Affected software

  • Schema & Structured Data for WP & AMP (WordPress plugin by Magazine3) — all versions prior to 1.60

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate — Patch: Update the Schema & Structured Data for WP & AMP plugin to version 1.60 or later. Version 1.60 was released on May 14, 2026 and contains the vendor-provided fix for this vulnerability.
  • If patching is delayed: Consider temporarily restricting access to WordPress AJAX endpoints (/wp-admin/admin-ajax.php) from untrusted sources at the web server or WAF layer, or disabling the plugin until the update can be applied.
  • Audit the WordPress media library for unexpected or suspicious file uploads that may indicate prior exploitation attempts.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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How IONIX’s External Exposure Management Platform Detects and Validates
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1

Map your entire attack surface (continously)

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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

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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

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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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