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CVE-2026-14952 – Sensitive File Disclosure – Frauscher FDS 102 (v2.0.0–2.13.3)

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Summary

CVE-2026-14952 is a missing authentication vulnerability (CWE-306) in Frauscher Sensortechnik’s FDS102 diagnostic system for FAdC/FAdCi R2. The FDS Web server exposes sensitive files — including /FdsBackup.zip and files under /downloads/* — over HTTP without requiring any authentication, allowing an unauthenticated remote attacker to retrieve detailed railway signaling and track layout information. The issue affects FDS102 versions 2.0.0 through 2.13.3 and was disclosed alongside seven related flaws in the same product as part of a coordinated disclosure through CERT@VDE.

Technical details

  • Root cause: The FDS Web server does not enforce authentication or authorization checks on certain HTTP endpoints that serve backup archives and downloadable files.
  • Trigger conditions: An attacker only needs network access to the device’s web interface; no credentials, session token, or user interaction are required.
  • Attack vector: Network (remote), via direct unauthenticated HTTP requests to paths such as /FdsBackup.zip and /downloads/*.
  • Impact: Disclosure of sensitive backup archives and files containing detailed railway signaling and track layout information, which could aid further reconnaissance or attacks against rail infrastructure. The impact is limited to confidentiality — no integrity or availability impact is indicated for this specific CVE.

Affected software

  • Frauscher Sensortechnik FDS102 for FAdC/FAdCi R2 — versions 2.0.0 through 2.13.3 (inclusive)

Severity

  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Update FDS102 to version 2.14.0, which resolves this vulnerability along with seven related issues (CVE-2026-14946 through CVE-2026-14953) disclosed in the same advisory.
  • If patching cannot be applied immediately:
    • Restrict network access to the FDS102 web interface to authorized personnel only; do not expose it to untrusted networks or the internet.
    • Ensure the device is connected only to category 2 networks; if connected to category 3 networks, apply additional protective measures (e.g., network segmentation, firewalling, VPN access) as recommended by the vendor.
    • Monitor and restrict access to /FdsBackup.zip and /downloads/* paths at the network or reverse-proxy layer where feasible until the patch is applied.

References

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