CVE-2025-65797 is a security vulnerability identified in the Identity Provider service component of usememos memos version 0.25.2. The flaw stems from incorrect access control mechanisms that fail to properly restrict low-privileged users from modifying or deleting registered identity providers. Identity providers are critical components that authenticate users and manage identity federation. By exploiting this vulnerability, an attacker with minimal privileges can alter or remove these identity providers, potentially enabling account takeover attacks by redirecting authentication flows or disabling legitimate authentication methods. Additionally, the attacker can cause Denial of Service (DoS) by deleting identity providers, preventing users from authenticating and accessing services. The vulnerability does not require high privileges or complex exploitation techniques, increasing its risk profile. No CVSS score has been assigned yet, and there are no known exploits in the wild, but the impact on confidentiality, integrity, and availability is significant. The vulnerability highlights the importance of enforcing strict access controls on identity management functions within applications that integrate multiple identity providers. Since usememos is a collaborative memo platform, organizations relying on it for internal communications or identity federation could be exposed to account compromise and service disruption.

For European organizations, this vulnerability poses a serious threat to both security and operational continuity. Account takeover risks can lead to unauthorized access to sensitive internal communications, intellectual property, and user data, potentially violating GDPR and other data protection regulations. The ability to delete identity providers can disrupt authentication services, causing Denial of Service and impacting business operations reliant on usememos for collaboration. Organizations in sectors with stringent compliance requirements, such as finance, healthcare, and government, could face regulatory penalties and reputational damage if exploited. The low privilege required to exploit this vulnerability increases the likelihood of insider threats or lateral movement attacks within compromised networks. Additionally, the lack of a patch or mitigation guidance at this time means organizations must proactively implement compensating controls to reduce risk.

1. Immediately review and restrict access permissions to the Identity Provider service within usememos, ensuring only trusted administrators have modification rights. 2. Implement strong role-based access control (RBAC) policies to prevent low-privileged users from accessing identity provider configuration functions. 3. Monitor logs and alerts for any unauthorized changes or deletions of identity providers to detect potential exploitation attempts early. 4. If possible, isolate the usememos deployment within a secure network segment to limit exposure. 5. Engage with the usememos vendor or community to obtain patches or updates addressing this vulnerability as soon as they become available. 6. Consider multi-factor authentication (MFA) for administrative access to reduce the risk of account takeover. 7. Conduct regular security audits and penetration tests focusing on identity management components. 8. Prepare incident response plans specific to identity provider compromise scenarios to minimize impact if exploited.