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CVE-2026-62414 – Unauthenticated Access Control Bypass – Page Builder CK for Joomla (versions 1.0…

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Summary

CVE-2026-62414 is a critical improper access control vulnerability (CWE-284) in the Page Builder CK extension for Joomla, developed by joomlack.fr, affecting all versions from 1.0.0 through 3.6.1. The extension fails to properly enforce access controls on frontend page list views, allowing any unauthenticated remote attacker to interact with page data without authorization. With a CVSS v3.1 base score of 9.1 (Critical) and both high Confidentiality and high Integrity impact, this vulnerability poses a significant risk to any organization running an affected version of the extension on a public-facing Joomla site.

Technical details

  • Root cause: Improper access control (CWE-284) — the extension does not apply proper authorization checks to frontend page list view endpoints, leaving them accessible without authentication.
  • Trigger conditions: No privileges and no user interaction are required; the flaw is exploitable by any unauthenticated remote actor over the network. Attack Complexity is Low, meaning no special conditions are needed.
  • Attack vector: Network — fully exploitable over the internet against any internet-facing Joomla installation running the affected extension.
  • Impact: High Confidentiality impact — unauthenticated attackers can access page data that should be restricted. High Integrity impact — as reflected in the CVSS vector (I:H). No Availability impact (A:N).
  • SSVC assessment: The exploitation path is automatable, meaning it can be reliably triggered at scale without manual intervention.

Affected software

  • Page Builder CK extension for Joomla (joomlack.fr): versions 1.0.0 through 3.6.1 (inclusive)

Severity

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

Mitigation and recommended actions

  • Immediate action: Upgrade the Page Builder CK extension to version 3.6.2 or later, which contains the fix for this vulnerability.
  • If immediate patching is not feasible: Restrict public network access to Joomla frontend endpoints associated with Page Builder CK (e.g., paths under /components/com_pagebuilderck/, /media/com_pagebuilderck/, /modules/mod_pagebuilderck/) via web server or WAF rules until the extension can be updated.
  • Additional context: The Page Builder CK extension has been the subject of multiple high-severity CVEs in 2026. Organizations running this extension should treat it as an elevated-risk component and prioritize its remediation.

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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