Sydney <= 2.56 - Missing Authorization to Authenticated (Subscriber+) Limited Theme Options Update

Missing Authorization
CVE CVE-2025-8999
CVSS Medium (5.3)
Publicly Published September 16, 2025
Last Updated October 28, 2025
Researcher Dmitrii Ignatyev
Description

The Sydney theme for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'activate_modules' function in all versions up to, and including, 2.56. This makes it possible for authenticated attackers, with Subscriber-level access and above, to activate or deactivate various theme modules.

References

1 affected software package

Software Type Theme
Software Slug sydney (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 2.56
Patched Version
  • 2.57
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