CVE-2025-49391 is a Cross-Site Request Forgery (CSRF) vulnerability identified in the Fetch Designs Sign-up Sheets product, affecting versions up to 2.3.3. CSRF vulnerabilities occur when an attacker tricks an authenticated user into submitting a forged request to a web application in which the user is currently authenticated. This can lead to unauthorized actions being performed without the user's consent. In this case, the vulnerability allows an attacker to craft malicious requests that, when executed by a logged-in user, could alter data or perform actions within the Sign-up Sheets application. The CVSS 3.1 base score is 4.3, indicating a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N) shows that the attack can be launched remotely over the network without privileges, requires low attack complexity, does not require privileges, but does require user interaction (the victim must click or visit a malicious link). The impact is limited to integrity (I:L) with no confidentiality or availability impact. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability stems from inadequate anti-CSRF protections in the affected product, allowing unauthorized state-changing requests to be accepted by the server when initiated by a victim user.

For European organizations using Fetch Designs Sign-up Sheets, this vulnerability could allow attackers to manipulate sign-up data or user actions within the application without authorization. While the confidentiality and availability of the system are not directly impacted, the integrity of the data can be compromised, potentially leading to incorrect sign-up records, unauthorized modifications, or disruption of scheduling and coordination activities. This could affect organizations relying on the product for event management, resource allocation, or collaborative scheduling, leading to operational inefficiencies or reputational damage. Since exploitation requires user interaction, phishing or social engineering campaigns targeting employees could be used to trigger the vulnerability. The medium severity suggests a moderate risk, but organizations with critical reliance on the application should consider the threat more seriously.

Organizations should implement or verify the presence of robust anti-CSRF protections such as synchronizer tokens (CSRF tokens) or same-site cookie attributes in their deployment of Fetch Designs Sign-up Sheets. Until an official patch is released, administrators should consider applying web application firewall (WAF) rules to detect and block suspicious cross-site requests targeting the application endpoints. User education to recognize phishing attempts and avoid clicking on suspicious links is also critical to reduce the risk of exploitation. Additionally, monitoring application logs for unusual or unauthorized state-changing requests can help detect attempted exploitation. If feasible, restricting access to the application to trusted networks or VPN users can reduce exposure. Organizations should track vendor communications for patches or updates addressing this vulnerability and apply them promptly once available.