CVE-2025-24776 is a Missing Authorization vulnerability (CWE-862) identified in the codelobster Responsive Flipbooks product, affecting versions up to 1.0. This vulnerability arises due to improperly configured access control mechanisms, allowing users with limited privileges (requiring low privilege level) to perform actions or access resources that should be restricted. The vulnerability is exploitable remotely over the network (AV:N), requires low attack complexity (AC:L), and does not require user interaction (UI:N). The scope of the vulnerability is unchanged (S:U), meaning the impact is limited to the vulnerable component itself. The impact affects integrity and availability but not confidentiality, as indicated by the CVSS vector (C:N/I:L/A:L). Specifically, an attacker with some level of authenticated access can exploit the missing authorization checks to modify or disrupt the flipbook content or functionality, potentially leading to data tampering or denial of service conditions within the application. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that mitigation may require vendor updates or manual access control reviews. The vulnerability was published in June 2025 and is rated as medium severity with a CVSS score of 5.4.

For European organizations using codelobster Responsive Flipbooks, this vulnerability could lead to unauthorized modification or disruption of digital flipbook content, which may be used for marketing, documentation, or customer engagement. The integrity compromise could damage brand reputation or misinform users, while availability impacts could disrupt business operations relying on these flipbooks. Although confidentiality is not directly affected, the loss of integrity and availability can have significant operational and reputational consequences, especially for sectors relying on accurate and reliable digital content delivery such as publishing, education, and marketing agencies. Since exploitation requires some level of authenticated access, insider threats or compromised credentials could be leveraged by attackers. The absence of known exploits reduces immediate risk but does not eliminate the potential for targeted attacks. Organizations should consider the criticality of the flipbook content and the exposure of the application to external or internal users when assessing risk.

To mitigate this vulnerability, European organizations should first conduct a thorough review of the access control configurations within the Responsive Flipbooks application, ensuring that authorization checks are correctly implemented for all sensitive operations. Restrict user privileges strictly on a need-to-access basis and monitor for unusual activities from authenticated users. Until an official patch is released, consider isolating the flipbook application behind additional security layers such as web application firewalls (WAFs) with custom rules to detect and block unauthorized access attempts. Implement strong authentication mechanisms and enforce multi-factor authentication (MFA) to reduce the risk of credential compromise. Regularly audit user accounts and permissions, and maintain detailed logging to detect potential exploitation attempts. Engage with the vendor for timely patch releases and apply updates promptly once available. Additionally, consider alternative secure solutions if the flipbook content is critical and cannot tolerate integrity or availability risks.