CVE-2026-25394: 
WordPress vulnerability analysis and mitigation

CVE-2026-25394 is a Missing Authorization vulnerability in the Fitness FSE WordPress theme developed by sparklewpthemes. The flaw allows authenticated attackers with low privileges to exploit incorrectly configured access control security levels, classified under CWE-862 (Missing Authorization). It affects Fitness FSE versions from n/a through 1.0.6. The vulnerability was published on February 19, 2026, and carries a CVSS v3.1 base score of 4.3 (Medium) (Feedly).

The root cause is a Missing Authorization flaw (CWE-862), where the Fitness FSE WordPress theme fails to properly verify whether a requesting user has the appropriate permissions before executing certain actions. An authenticated attacker with low-level privileges can send crafted network requests to trigger restricted functionality without proper authorization checks. No user interaction is required, and the attack complexity is low, making it straightforward to exploit once authenticated (Feedly).

Successful exploitation results in a limited integrity impact — an attacker can perform unauthorized actions within the WordPress site, such as modifying theme-related settings or data they should not have access to. There is no confidentiality or availability impact associated with this vulnerability. The scope is unchanged, meaning the impact is confined to the vulnerable component itself (Feedly).

The vulnerability requires a low-privilege authenticated account to exploit, reducing but not eliminating risk in environments with open user registration. The EPSS score is approximately 0.017%, indicating a low probability of active exploitation in the near term. No public proof-of-concept exploit code, in-the-wild exploitation, or CISA KEV catalog listing has been identified for this CVE (Feedly).

1. Obtain low-privilege access: Register or obtain a low-privilege WordPress account (e.g., Subscriber role) on a site running the Fitness FSE theme version 1.0.6 or earlier.
2. Identify unprotected endpoints: Enumerate WordPress AJAX actions or REST API endpoints exposed by the Fitness FSE theme that lack proper capability checks.
3. Craft unauthorized request: Send a crafted HTTP POST or GET request to the identified endpoint (e.g., via admin-ajax.php or a REST route) without the expected authorization, leveraging the low-privilege session cookie or nonce.
4. Achieve unauthorized action: Successfully trigger a restricted theme action — such as modifying theme settings or content — that should require higher privileges, resulting in an integrity impact on the WordPress site (Feedly).

• Logs: WordPress access logs showing authenticated low-privilege users making repeated requests to admin-ajax.php or REST API endpoints associated with the Fitness FSE theme with unexpected action parameters.
• WordPress Activity: Unexpected changes to theme settings or content not attributable to administrator or editor accounts.
• Network: Unusual POST requests from subscriber-level accounts targeting WordPress admin endpoints related to theme configuration (Feedly).

Users should update the Fitness FSE WordPress theme to a version beyond 1.0.6 that includes proper authorization checks. Until a patched version is available, site administrators should restrict user registration to trusted individuals and limit the number of low-privilege accounts. Additionally, a Web Application Firewall (WAF) such as those offered by Patchstack or Wordfence can provide virtual patching to block exploitation attempts (Feedly, Patchstack).