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CVE-2026-16604 – Unauthenticated Protected Content Disclosure – Passster WordPress Plugin < 4.3.6

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Summary

CVE-2026-16604 is a sensitive information exposure vulnerability (CWE-200) in the Passster – Password Protect Pages and Content WordPress plugin (slug content-protector) affecting all versions before 4.3.6. The plugin outputs password-protected block content in the public page response before the password is verified, allowing unauthenticated attackers to recover protected content without knowing the password. It is rated High severity with a CVSS v3.1 base score of 7.5.

Technical details

  • Root cause: The plugin embeds the password-protected block content in the public page response before validating the supplied password, so the restricted material is present in the response regardless of authentication.
  • Trigger conditions: No authentication or user interaction is required; an attacker simply requests the page hosting the protected content.
  • Attack vector: Network — the flaw is reachable remotely over HTTP against any public page using the plugin’s content-lock block.
  • Impact: Disclosure of password-protected content to unauthenticated users. Confidentiality impact is High; there is no impact to integrity or availability.

Affected software

  • Passster – Password Protect Pages and Content (WordPress plugin, slug content-protector): all versions before 4.3.6.

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 Passster plugin to version 4.3.6 or later, which addresses the issue.
  • If no patch can be applied: Restrict or remove reliance on the plugin for protecting sensitive content until the update is installed, and consider placing genuinely sensitive material behind server-side access controls rather than client-visible page content.

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/content-protector/

References

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Map your entire attack surface (continously)

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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

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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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