What is CVE-2025-8999?

CVE-2025-8999 is a medium-severity vulnerability in Athemes Sydney, classified under Missing Authorization. CVSS score: 5.3/10. Published 2025-09-17.

How severe is CVE-2025-8999?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Is CVE-2025-8999 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Athemes Sydney

CVE-2025-8999

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.

Vulnerability class: Broken Access Control

EPSS: 0.003 (18.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Athemes Sydney — versions 0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

Frequently asked questions

What is CVE-2025-8999?: CVE-2025-8999 is a medium-severity vulnerability in Athemes Sydney, classified under Missing Authorization. CVSS score: 5.3/10. Published 2025-09-17.
How severe is CVE-2025-8999?: Medium severity. CVSS v3 base score is 5.3 out of 10.
Is CVE-2025-8999 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.