CVE-2025-65798 is a vulnerability identified in usememos memos version 0.25.2, characterized by incorrect access control mechanisms. Specifically, the flaw allows users with low-level privileges—such as standard authenticated users without administrative rights—to arbitrarily modify or delete attachments uploaded by other users. This indicates a failure in the application’s authorization checks, where the system does not properly verify ownership or permission before permitting modification or deletion of attachments. The vulnerability undermines the integrity and confidentiality of user data, as unauthorized users can alter or remove files they do not own, potentially disrupting workflows or causing data loss. The vulnerability was reserved on November 18, 2025, and published on December 8, 2025, but no CVSS score or patches have been released yet. No known exploits have been reported in the wild, suggesting that active exploitation is not currently observed. However, the ease of exploitation—requiring only low-level privileges and no complex conditions—makes it a significant risk. The affected software, usememos memos, is a collaborative note-taking or memo management tool, likely used in organizational environments for sharing documents and attachments. The lack of proper access control could be exploited by malicious insiders or compromised user accounts to tamper with critical attachments, leading to operational disruption or data integrity issues. Given the nature of the vulnerability, it primarily impacts confidentiality and integrity, with availability potentially affected if attachments are deleted. The scope includes all installations running version 0.25.2 of usememos memos. Organizations relying on this software should prioritize identifying affected instances and prepare for patch deployment once available.

For European organizations, this vulnerability poses a significant risk to data integrity and confidentiality within collaborative environments. Unauthorized modification or deletion of attachments can disrupt business processes, cause loss of critical information, and undermine trust in document management systems. This could lead to compliance issues, especially under GDPR, where data integrity and protection are mandatory. The risk is heightened in sectors with sensitive or regulated data, such as finance, healthcare, and government. Additionally, the ability for low-privilege users to perform these actions increases the likelihood of insider threats or exploitation of compromised accounts. Operational disruptions from data tampering could impact productivity and lead to financial losses or reputational damage. Since no patches are currently available, organizations face a window of exposure. The absence of known exploits reduces immediate risk but does not eliminate the threat, as attackers could develop exploits rapidly given the straightforward nature of the vulnerability.

1. Immediately audit current usememos memos deployments to identify instances running version 0.25.2 or earlier. 2. Restrict user privileges to the minimum necessary, enforcing strict role-based access controls to limit attachment modification capabilities. 3. Implement monitoring and alerting on attachment modification and deletion activities to detect suspicious behavior promptly. 4. Isolate usememos memos instances within secure network segments to reduce exposure to unauthorized users. 5. Engage with the usememos development community or vendor to obtain patches or updates addressing this vulnerability as soon as they become available. 6. Consider temporary compensating controls such as disabling attachment uploads or restricting attachment management to trusted users until a patch is applied. 7. Educate users about the risks of sharing credentials and encourage strong authentication practices to reduce account compromise risks. 8. Regularly back up attachments and memos to enable recovery in case of unauthorized deletion or modification.