Server-Side Request Forgery in usememos

Executive Summary

CVE-2026-51583 is a Server-Side Request Forgery (SSRF) vulnerability in the Memos application up to version 0.30.0. It allows a remote authenticated attacker to manipulate the system into making HTTP requests to internal or unspecified network addresses by exploiting an incomplete reserved-CIDR list in the webhook validation mechanism.

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Detection Guidance

Check Memos logs for unusual outbound HTTP requests to internal or unexpected addresses. Inspect webhook configurations for targets pointing to reserved IPs like 0.0.0.0, 10.0.0.0/8, or 192.168.0.0/16. Use network monitoring tools to detect SSRF attempts from the Memos application.

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Impact Analysis

An attacker could exploit this to send requests to internal services within the Memos container, potentially accessing sensitive data or services not intended to be exposed. This could lead to data breaches, unauthorized actions, or further network compromise depending on the internal services.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Compliance could be compromised if internal services handling regulated data are accessed.

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Mitigation Strategies

Upgrade to the latest version of Memos if a patch is released. If no patch exists, disable webhook functionality or restrict webhook targets to trusted external domains. Implement network policies to block outbound connections to internal IP ranges from the Memos container.

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