CVE-2025-65795 is a security vulnerability identified in usememos memos version 0.25.2, specifically affecting the /api/v1/user endpoint. The vulnerability arises from incorrect access control mechanisms that fail to properly restrict the creation of user accounts. An attacker can exploit this flaw by sending a specially crafted request to the vulnerable API endpoint, allowing them to create arbitrary user accounts without any authentication or authorization checks. This bypass of access control can lead to unauthorized access to the system, enabling attackers to potentially escalate privileges, impersonate legitimate users, or manipulate application data. The vulnerability does not currently have a CVSS score and no known exploits have been reported in the wild, but the nature of the flaw suggests it could be exploited relatively easily due to the lack of authentication requirements. The absence of patch links indicates that a fix may not yet be publicly available, increasing the urgency for affected organizations to implement compensating controls. The vulnerability impacts the confidentiality and integrity of the system by allowing unauthorized account creation, which could be leveraged for further attacks or data breaches. The scope is limited to installations running the affected version of usememos memos, but given the popularity of collaborative note-taking and memo tools, the potential attack surface could be significant. The vulnerability was reserved and published in late 2025, indicating recent discovery and disclosure.

For European organizations using usememos memos v0.25.2, this vulnerability could lead to unauthorized account creation, undermining the integrity of user management and potentially allowing attackers to gain elevated access or persist within the system. This could result in data manipulation, unauthorized data access, or disruption of collaborative workflows. Organizations in sectors with strict data protection requirements, such as finance, healthcare, and government, could face compliance risks if unauthorized accounts lead to data breaches. The vulnerability could also facilitate insider threat scenarios if attackers create accounts that mimic legitimate users. The lack of authentication requirements for exploitation increases the risk of automated attacks and large-scale abuse. While no exploits are currently known, the vulnerability's characteristics suggest it could be weaponized quickly once a public exploit is developed. The impact on availability is limited but could occur if attackers use the vulnerability to flood the system with bogus accounts, potentially degrading service performance.

Until an official patch is released, European organizations should implement strict network-level access controls to restrict access to the /api/v1/user endpoint, allowing only trusted IP addresses or VPN connections. Employing Web Application Firewalls (WAFs) with custom rules to detect and block anomalous account creation patterns can help mitigate exploitation attempts. Organizations should enable detailed logging and monitoring of user account creation activities to identify suspicious behavior promptly. If possible, disable or restrict the user creation API endpoint temporarily or require additional authentication layers such as API keys or OAuth tokens. Conduct regular audits of user accounts to detect and remove unauthorized or suspicious entries. Engage with the usememos memos vendor or community to obtain patches or updates as soon as they become available. Educate development and operations teams about the vulnerability to ensure rapid response and remediation. Finally, consider implementing multi-factor authentication (MFA) for all user accounts to reduce the impact of unauthorized account creation.