CVE-2025-56760 is a path traversal vulnerability affecting the Memos application version 0.22 when it is configured to store objects locally. The vulnerability arises in the CreateResource endpoint, which improperly sanitizes or validates the filename input. An attacker can exploit this flaw by submitting a crafted filename containing path traversal sequences (e.g., '../') that allow writing files outside the intended storage directory. This arbitrary file write capability can enable attackers to overwrite critical files on the server, potentially leading to remote code execution, privilege escalation, or denial of service depending on the files overwritten and the server configuration. Since the vulnerability requires the Memos application to be configured for local object storage, the attack surface is limited to deployments using this configuration. There is no CVSS score assigned yet, and no known public exploits have been reported. However, the vulnerability's nature suggests a serious risk if exploited, as arbitrary file write is a common vector for severe post-exploitation activities. The lack of patch links indicates that a fix may not yet be publicly available, emphasizing the need for immediate mitigation and monitoring.

For European organizations using Memos 0.22 with local object storage enabled, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized modification or creation of files on critical servers, potentially compromising confidentiality, integrity, and availability of data and services. This could result in data breaches, service disruptions, or the deployment of malware such as web shells. Organizations in sectors with strict data protection regulations (e.g., GDPR) could face legal and financial repercussions if sensitive data is exposed or systems are compromised. Additionally, the ability to write arbitrary files may facilitate lateral movement within networks, increasing the scope of impact. Given the lack of known exploits, the threat may currently be low, but the vulnerability's characteristics warrant proactive measures to prevent future exploitation.

1. Immediately audit all Memos 0.22 deployments to identify those configured with local object storage. 2. Restrict access to the CreateResource endpoint to authenticated and authorized users only, minimizing exposure. 3. Implement strict input validation and sanitization on filenames submitted to the CreateResource endpoint to reject any path traversal sequences. 4. Employ web application firewalls (WAFs) with rules to detect and block path traversal attempts targeting this endpoint. 5. Monitor server file system changes and application logs for suspicious activity indicative of exploitation attempts. 6. If possible, temporarily disable local object storage or migrate to alternative storage configurations until a patch is available. 7. Engage with the Memos development community or vendor for updates and patches addressing this vulnerability. 8. Conduct regular security assessments and penetration tests focusing on file upload and path traversal vectors.