CVE-2025-8999: Athemes Sydney

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Athemes Sydney: up to and including 2.56

Published 2025-09-17. Last modified 2026-09-26.