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CVE-2026-13153 – Unauthenticated Information Disclosure – Essential Blocks WordPress Plugin before 6

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Summary

CVE-2026-13153 is an unauthenticated information disclosure vulnerability in the Essential Blocks WordPress plugin (Gutenberg Essential Blocks) in all versions before 6.4.0. The plugin fails to restrict access to a public REST route, allowing unauthenticated attackers to read a non-public WooCommerce sales metric. It carries a CVSS v3.1 base score of 7.5 (High).

Technical details

  • Root cause: Insufficient access control on a public REST API route, combined with over-fetching of a non-public WooCommerce per-product sales metric in the API response (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor).
  • Trigger conditions: An attacker queries the exposed REST endpoint; no authentication or user interaction is required.
  • Attack vector: Network-based, exploitable remotely against the site’s REST API.
  • Impact: Disclosure of the lifetime number of units sold for any published product, exposing confidential sales data. No impact to integrity or availability.

Affected software

  • Essential Blocks WordPress plugin — all versions before 6.4.0.

Severity

  • CVSS v3.1 base score: 7.5 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade the Essential Blocks plugin to version 6.4.0 or later.
  • If no patch can be applied: Restrict or block external access to the affected plugin REST route at the web server or WAF layer, or deactivate the plugin until it can be updated.

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 response body: /wp-content/plugins/essential-blocks/

References

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Map your entire attack surface (continously)

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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.

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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

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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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