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CVE-2026-54343 – Path Traversal / Arbitrary File Read – Frappe LMS < 2.52.1

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Summary

CVE-2026-54343 is a path traversal vulnerability (CWE-22) in Frappe Learning Management System (LMS) that allows a remote, unauthenticated attacker to read arbitrary files accessible to the server process. The flaw resides in the SCORM file-serving component and carries a High severity rating (CVSS 8.7). No authentication or user interaction is required to exploit it.

Technical details

  • Root cause: The SCORMRenderer.render function in lms/page_renderers.py constructs and opens a server-side file path without first verifying that the resolved real path remains within the intended public/scorm directory.
  • Trigger condition: An attacker sends a crafted request containing path traversal sequences to the SCORM file-serving endpoint.
  • Attack vector: Network — the endpoint is reachable remotely with no privileges and no user interaction required.
  • Impact: Disclosure of arbitrary files on the server that are accessible to the application process (confidentiality impact only; no integrity or availability impact).

Affected software

  • Frappe Learning Management System (LMS): all versions prior to 2.52.1

Severity

  • CVSS Score: 8.7 (High)
  • Vector: 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: Upgrade Frappe LMS to version 2.52.1 or later, which validates that resolved SCORM file paths remain within the public/scorm directory before serving them.
  • If immediate patching is not possible: Restrict or disable public access to the SCORM file-serving endpoint at the network/reverse-proxy layer, and monitor server logs for requests containing directory traversal sequences (e.g., ../) targeting SCORM paths until the upgrade can be applied.

References

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