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The vulnerability in usememos memos v0.25.2 stems from improper access control mechanisms within the attachment management functionality. Specifically, the application fails to enforce authorization checks on API endpoints responsible for modifying or deleting user attachments. Attackers with low-level privileges, such as basic authenticated users, can exploit this by sending crafted HTTP requests to these endpoints. The endpoints likely include operations like DELETE or PUT for attachment resources without verifying if the requester owns the attachment or has necessary permissions. This flaw arises due to missing role-based access control (RBAC) or insufficient user identity validation during attachment operations. The application trusts user-provided attachment identifiers without associating them with the creator’s session or role. For example, an endpoint such as `/api/attachments/{id}` may process requests from any authenticated user, regardless of ownership. Attackers can use tools like curl or browser developer tools to intercept legitimate requests and manipulate parameters. By changing the attachment ID in requests, they can target attachments belonging to other users. The vulnerability is network-exploitable and requires only low-privilege access, which is often easily obtained in self-hosted memo systems. The core issue is in the business logic that handles attachment permissions, allowing unauthorized actions due to lack of server-side checks. This can lead to data loss, manipulation, and breach of confidentiality, as attachments may contain sensitive information. The flaw is particularly critical in multi-user environments where shared resources are common. Exploitation does not require advanced techniques; simple HTTP requests can trigger the vulnerability. Mitigation involves implementing proper authorization checks before any attachment operation, ensuring user context is validated. Developers must review access control logic across all user-facing endpoints to prevent similar issues.
Platform: usememos memos
Version: v0.25.2
Vulnerability : Incorrect access control
Severity: Moderate
date: Dec 8 2025
Prediction: Patch expected soon
What Undercode Say:
Analytics:
curl -X GET http://target/api/version
curl -X DELETE http://target/api/attachments/1
curl -X POST http://target/api/attachments/update –data ‘{“id”:”2″}’
grep -r “access control” usememos/
npm audit for dependencies
docker inspect usememos_image
how Exploit:
Authenticate with low-privilege account.
Identify attachment IDs via network traffic.
Send modified DELETE/PUT requests.
Bypass authorization checks entirely.
Use scripting for mass exploitation.
Protection from this CVE
Update to patched version.
Implement strict authorization checks.
Review access control logic.
Use role-based permissions.
Audit attachment endpoints.
Impact:
Unauthorized attachment modification/deletion.
Data loss and manipulation.
Breach of confidentiality.
Potential system compromise.
Reputational damage.
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Sources:
Reported By: github.com
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