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CVE-2026-66914 – Unauthenticated Path Traversal (Arbitrary File Read) – SEBLOD for Joomla 1.0.0–3.29

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Summary

CVE-2026-66914 is an unauthenticated path traversal vulnerability in the SEBLOD content construction kit extension for Joomla, developed by seblod.com. A remote attacker can read arbitrary files from both inside and outside the webroot without any authentication or user interaction. The issue is rated Critical (CVSS 9.2).

Technical details

  • Root cause: Improper limitation of a pathname to a restricted directory (path traversal, CWE-22), allowing user-supplied input to reference files outside the intended directory.
  • Trigger conditions: No authentication, privileges, or user interaction required; the flaw is reachable over the network.
  • Attack vector: Network — a remote, unauthenticated attacker crafts a request to the vulnerable component.
  • Impact: Disclosure of arbitrary files from inside and outside the webroot, resulting in a high loss of confidentiality (e.g., configuration files and secrets).

Affected software

  • SEBLOD for Joomla 1.0.0 through 3.29.0
  • SEBLOD for Joomla 4.0.0 through 4.6.0
  • SEBLOD for Joomla 5.0.0 through 6.0.0

Severity

  • CVSS v4.0 base score: 9.2 (Critical)
  • Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to a fixed release — SEBLOD 3.30.0 or later, 4.7.0 or later, or 6.0.1 or later, matching your major release branch.
  • If no patch can be applied yet: Restrict network access to the Joomla site, and use a web application firewall or reverse-proxy rules to block path traversal sequences targeting the SEBLOD (com_cck) component.

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.

  • Content of the generator meta tag: Joomla! - Open Source Content Management
  • Raw response body: option=com_cck, /media/cck/css/cck.css, /media/cck/css/cck.responsive.css, /media/cck/js/cck.calculation-*.min.js

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.

Are you exposed?

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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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