CVE-2026-32110
Received Received - Intake
Server-Side Request Forgery in SiYuan /api/network/forwardProxy

Publication date: 2026-03-11

Last updated on: 2026-03-13

Assigner: GitHub, Inc.

Description
SiYuan is a personal knowledge management system. Prior to 3.6.0, the /api/network/forwardProxy endpoint allows authenticated users to make arbitrary HTTP requests from the server. The endpoint accepts a user-controlled URL and makes HTTP requests to it, returning the full response body and headers. There is no URL validation to prevent requests to internal networks, localhost, or cloud metadata services. This vulnerability is fixed in 3.6.0.
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Meta Information
Published
2026-03-11
Last Modified
2026-03-13
Generated
2026-06-16
AI Q&A
2026-03-11
EPSS Evaluated
2026-06-14
NVD
CVE-2026-32110
EUVD
EUVD-2026-11381
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
b3log siyuan to 3.6.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

The vulnerability exists in SiYuan, a personal knowledge management system, in versions prior to 3.6.0. The /api/network/forwardProxy endpoint allows authenticated users to make arbitrary HTTP requests from the server by providing a user-controlled URL. The server then makes the HTTP request to that URL and returns the full response body and headers. There is no validation to restrict URLs, meaning requests can be made to internal networks, localhost, or cloud metadata services.

Impact Analysis

This vulnerability can have serious impacts because it allows an authenticated user to make arbitrary HTTP requests from the server to potentially sensitive internal resources. This can lead to unauthorized access to internal network services, exposure of sensitive data from localhost or cloud metadata services, and potentially further exploitation of the internal environment. The CVSS score of 8.3 indicates a high severity with high impact on confidentiality, integrity, and low impact on availability.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, upgrade SiYuan to version 3.6.0 or later, where the issue with the /api/network/forwardProxy endpoint has been fixed.

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