AP Background 3.8.1 - 3.8.2 - Missing Authorization to Authenticated (Subscriber+) Arbitrary File Upload via advParallaxBackAdminSaveSlider Function

Unrestricted Upload of File with Dangerous Type
CVE CVE-2025-9561
CVSS High (8.8)
Publicly Published October 2, 2025
Last Updated October 3, 2025
Researcher kr0d
Description

The AP Background plugin for WordPress is vulnerable to arbitrary file uploads due to missing authorization and insufficient file validation within the advParallaxBackAdminSaveSlider() handler in versions 3.8.1 to 3.8.2. This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.

References

1 affected software package

Software Type Plugin
Software Slug ap-background (view on wordpress.org)
Patched? No
Affected Version
  • 3.8.1 - 3.8.2
Patched Version
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