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CVE-2026-13154 – Unauthenticated Information Exposure – Essential Blocks WordPress Plugin before 6.4

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Summary

CVE-2026-13154 is an unauthenticated information exposure vulnerability (CWE-200) in the Gutenberg Essential Blocks WordPress plugin in all versions before 6.4.0. A public REST API route fails to verify that a requested post type is publicly viewable, allowing attackers to read published content from post types registered as non-public. The issue carries a CVSS v3.1 base score of 7.5 (High).

Technical details

  • Root cause: One of the plugin’s public REST API routes does not validate whether the user-supplied post type is publicly viewable before querying it.
  • Trigger conditions: An unauthenticated request to the affected REST endpoint specifying a non-public custom post type.
  • Attack vector: Network; no authentication, privileges, or user interaction required, and the request is straightforward to automate.
  • Impact: Disclosure of published entries belonging to custom post types the site registered as non-public, resulting in high confidentiality impact with no effect on integrity or availability.

Affected software

  • Gutenberg 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: Update the Essential Blocks plugin to version 6.4.0 or later.
  • If no patch can be applied: Restrict access to the plugin’s REST API routes at the network or web server/WAF layer, and avoid storing sensitive data in non-public custom post types until the update is in place.

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/essential-blocks/

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)

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2

Monitor for new CVEs

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3

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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

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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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