CVE-2025-58226 is a medium severity vulnerability identified in the iberezansky 3D FlipBook – PDF Flipbook Viewer, Flipbook Image Gallery plugin, affecting versions up to 1.16.16. The vulnerability is classified under CWE-201, which involves the insertion of sensitive information into sent data. Specifically, this flaw allows an attacker to retrieve embedded sensitive data that the plugin inadvertently includes in its transmitted data streams. The CVSS 3.1 base score is 5.3, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is limited to confidentiality (C:L), with no impact on integrity or availability. This suggests that an unauthenticated remote attacker can exploit this vulnerability over the network without user interaction to access sensitive information embedded in the data sent by the plugin. The vulnerability does not currently have known exploits in the wild, and no patches have been linked yet. The issue likely arises from improper handling or sanitization of sensitive data within the plugin's data transmission processes, potentially exposing confidential information embedded in PDF flipbooks or image galleries to unauthorized parties.

For European organizations, especially those using WordPress or similar CMS platforms with the iberezansky 3D FlipBook plugin, this vulnerability poses a risk of sensitive data leakage. Organizations that publish confidential or proprietary documents via this plugin could inadvertently expose sensitive embedded information to attackers who can intercept or access the transmitted data. This could lead to information disclosure incidents affecting customer data, intellectual property, or internal documents. While the vulnerability does not allow modification or disruption of services, the confidentiality breach could have regulatory implications under GDPR, especially if personal data is exposed. The medium severity indicates a moderate risk, but the ease of exploitation and lack of required privileges increase the threat level. Attackers could leverage this vulnerability to gather intelligence or sensitive content without alerting the victim or requiring complex attack vectors.

European organizations should immediately audit their use of the iberezansky 3D FlipBook plugin and identify if versions up to 1.16.16 are in use. Until an official patch is released, organizations should consider disabling or removing the plugin to prevent data leakage. If disabling is not feasible, restrict access to pages using the plugin via authentication or IP whitelisting to limit exposure. Additionally, review the content published through the plugin to ensure no sensitive information is embedded unnecessarily. Network-level protections such as enforcing HTTPS and using Web Application Firewalls (WAFs) with custom rules to detect anomalous data transmissions related to the plugin may help mitigate exploitation. Monitoring network traffic for unusual data patterns associated with the plugin's data transmissions can provide early detection. Finally, maintain vigilance for vendor updates or patches and apply them promptly once available.