ExampleCMS unrestricted file upload

An authenticated content editor can upload a file type outside the intended media policy.

Published 31 Aug 2026Updated 1 Sep 20267 sources
CVSS 7.5

What happened

The media upload workflow relies on an incomplete file-type validation sequence for authenticated editors.

Affected versions

ExampleCMS: ≤ 2.6.3 Fixed: 2.6.4.

Why it matters

Content-management systems frequently expose uploaded content through the web tier, increasing the impact of policy bypasses.

Detection & mitigation

  • Upgrade to ExampleCMS 2.6.4.
  • Restrict editor roles.
  • Store uploaded files outside executable web paths.

Public PoC references

No public PoC reference has passed the current publication threshold.