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CVE-2026-78284 – Unauthenticated Arbitrary File Deletion – MasterStudy LMS WordPress Plugin ≤ 3.7.42

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Summary

CVE-2026-78284 is a path traversal vulnerability in the MasterStudy LMS WordPress plugin (developed by Stylemix) that allows unauthenticated attackers to delete arbitrary files on the affected server. The flaw affects all plugin versions up to and including 3.7.42 and carries a High severity CVSS v3.1 score of 8.6.

Technical details

  • Root cause: CWE-22, Improper Limitation of a Pathname to a Restricted Directory (path traversal), in the plugin’s file-handling logic.
  • Trigger conditions: No authentication or user interaction is required to exploit the flaw.
  • Attack vector: Network — the vulnerability can be exploited remotely over HTTP(S) against any internet-facing WordPress site running the vulnerable plugin.
  • Impact: Arbitrary file deletion on the underlying server, which can lead to denial of service, site disruption, or, depending on which files are removed, further compromise of site availability.

Affected software

  • MasterStudy LMS WordPress plugin (masterstudy-lms-learning-management-system): versions up to and including 3.7.42
  • Fixed in version 3.7.43

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the MasterStudy LMS WordPress plugin to version 3.7.43 or later.
  • If patching is not immediately possible: Restrict or monitor unauthenticated access to the plugin’s endpoints where feasible, enforce least-privilege file system permissions for the web server user to limit the impact of arbitrary deletions, and maintain current backups to enable recovery from file-deletion incidents.

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/masterstudy-lms-learning-management-system/

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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  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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