CVE-2026-51583

Deferred Deferred - Pending Action

Server-Side Request Forgery in usememos

Publication date: 2026-08-11

Last updated on: 2026-08-31

Assigner: MITRE

Description

An issue in usememos through v0.30.0 allows a remote authenticated attacker to perform Server-Side Request Forgery (SSRF) via the Webhook validation mechanism in internal/webhook/validate.go, by setting a webhook target to an internal address.

CVSS Scores

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Meta Information

Published

2026-08-11

Last Modified

2026-08-31

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-51583

EUVD

EUVD-2026-56176

Affected Vendors & Products

Vendor	Product	Version / Range
usememos	memos	to 0.30.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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.

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.

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.

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.

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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