CVE-2025-8999
Sydney <= 2.56 - Missing Authorization to Authenticated (Subscriber+) Limited Theme Options Update
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | athemes |
| Product | sydney |
| Published | Sep 17, 2025 |
| Last Updated | Apr 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
athemes / Sydney
0 ≤ 2.56
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/965582c6-a52e-4f88-81ef-b5dd761a0c23?source=cve themes.trac.wordpress.org: https://themes.trac.wordpress.org/browser/sydney/2.55/inc/classes/class-sydney-modules.php#L166 themes.trac.wordpress.org: https://themes.trac.wordpress.org/browser/sydney/2.55/inc/modules/class-sydney-modules.php#L72 themes.trac.wordpress.org: https://themes.trac.wordpress.org/changeset/288374/ research.cleantalk.org: https://research.cleantalk.org/cve-2025-8999/
Credits
Dmitrii Ignatyev