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CVE-2026-66915 – Unauthenticated Remote Code Execution – Fabrik Joomla Extension 1.0.0 through 4.6.6

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Summary

CVE-2026-66915 is a critical, unauthenticated remote code execution (code injection) vulnerability in the Fabrik extension for Joomla. An attacker can execute arbitrary code by abusing the ajax_calc feature of the calc plugin, with no authentication required. The issue carries a maximum CVSS base score of 10.0.

Technical details

  • Root cause: Improper control of generation of code (CWE-94) in the calc plugin’s ajax_calc feature, allowing attacker-supplied input to be executed as code.
  • Trigger conditions: An attacker invokes the ajax_calc functionality of the calc plugin; no authentication or user interaction is required.
  • Attack vector: Network — the flaw is reachable remotely over the internet against exposed Fabrik/Joomla instances.
  • Impact: Arbitrary code execution on the affected host, resulting in full compromise of confidentiality, integrity, and availability.

Affected software

  • Fabrik extension for Joomla, versions 1.0.0 through 4.6.6 (all versions below 4.6.7).

Severity

  • CVSS 4.0 base score: 10.0 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Mitigation and recommended actions

  • Immediate: Upgrade the Fabrik extension to version 4.6.7 or later, which remediates the vulnerability.
  • If patching is not immediately possible: Restrict network access to the affected Joomla instance and block requests to the calc plugin’s ajax_calc functionality at the web application firewall or reverse proxy until the update can be applied.

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: /media/com_fabrik/, /components/com_fabrik/

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)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

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

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

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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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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