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CVE-2026-66656 – Unauthenticated Local File Inclusion – Foton Core WordPress Theme Component (≤ 1.1.

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Summary

CVE-2026-66656 is an unauthenticated Local File Inclusion (LFI) vulnerability in the Foton Core plugin bundled with the Foton WordPress theme by Mikado-Themes, affecting versions up to and including 1.1.1. The flaw allows a remote, unauthenticated attacker to force the plugin to include arbitrary files on the server, and it carries a HIGH severity rating of 8.1.

Technical details

  • Root cause: improper control of filename input used in a PHP include/require statement (CWE-98), allowing attacker-supplied paths to be included by the application.
  • Trigger conditions: no authentication or user interaction is required to reach the vulnerable code path.
  • Attack vector: network-based (AV:N), though attack complexity is rated high (AC:H), indicating some non-trivial conditions must align for exploitation.
  • Impact: successful exploitation can compromise confidentiality, integrity, and availability of the hosting environment, consistent with local file inclusion leading to disclosure of sensitive files or, depending on server configuration, code execution.

Affected software

  • Foton Core (WordPress theme companion plugin) by Mikado-Themes: versions up to and including 1.1.1

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Foton Core to a version newer than 1.1.1 that resolves this issue.
  • If no patch is available or cannot be applied immediately: restrict direct internet access to the WordPress admin and plugin endpoints, deploy a web application firewall rule to block path traversal/LFI patterns in requests, and monitor server logs for anomalous file-inclusion attempts targeting the theme/plugin.

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/foton-core/

References

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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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