CVE-2025-15526 is a vulnerability classified under CWE-209, which involves the generation of error messages containing sensitive information. The Fancy Product Designer plugin for WordPress, widely used for creating customizable product designs on e-commerce sites, contains an improper error handling flaw in its PDF upload functionality. When an error occurs during PDF upload, the plugin discloses full server filesystem paths and stack traces in the error messages returned to the client. This full path disclosure (FPD) vulnerability allows unauthenticated attackers to gain insight into the underlying server directory structure and application stack, which can be leveraged to identify other vulnerabilities or misconfigurations. The vulnerability affects all versions up to and including 6.4.8. The CVSS v3.1 base score is 5.3, indicating a medium severity level with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N, meaning it is remotely exploitable without authentication or user interaction, impacts confidentiality by leaking path information, but does not affect integrity or availability. Although the disclosed information alone does not directly compromise the system, it can be a valuable asset for attackers conducting further reconnaissance or chaining with other exploits. No public exploits or active exploitation have been reported to date. The lack of a patch link suggests that a fix may not yet be available, underscoring the importance of temporary mitigations. The vulnerability is particularly relevant for WordPress sites using this plugin, especially those handling PDF uploads in e-commerce or product customization contexts.

For European organizations, this vulnerability poses a moderate risk primarily by aiding attackers in gathering sensitive server information that can facilitate more severe attacks such as remote code execution or privilege escalation if other vulnerabilities exist. E-commerce platforms and businesses relying on Fancy Product Designer for product customization are at risk of targeted reconnaissance. Disclosure of full filesystem paths can reveal server configurations, directory structures, and potentially sensitive file locations, increasing the attack surface. While the vulnerability does not directly compromise data integrity or availability, it weakens the security posture and could lead to data breaches or service disruptions if exploited in combination with other flaws. Organizations in sectors with high online retail activity, such as Germany, France, and the UK, may face increased targeting due to the commercial value of their websites. Additionally, GDPR compliance requires minimizing exposure of sensitive information, so this vulnerability could have regulatory implications if exploited.

Since no official patch is currently linked, European organizations should implement immediate mitigations to reduce exposure. These include disabling or restricting PDF upload functionality in the Fancy Product Designer plugin until a patch is available. Web application firewalls (WAFs) should be configured to detect and block requests triggering PDF upload errors or attempts to exploit this vulnerability. Custom error handling can be implemented to suppress detailed error messages and stack traces, replacing them with generic error responses that do not reveal server paths. Regularly monitoring web server logs for suspicious activity related to PDF uploads or error message requests is advised. Organizations should also ensure that WordPress core, plugins, and themes are kept up to date and conduct thorough vulnerability assessments to identify and remediate any chained vulnerabilities that could be exploited alongside this issue. Finally, segmenting web servers and limiting access to sensitive directories can reduce the impact of any information disclosure.