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Response snapshot Nov 5, 2026, 22:51 UTC

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VulnerabilityCVE-2026-32110

SiYuan has a Full-Read SSRF via /api/network/forwardProxy

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.

At a glance

Exploited
Not known
Severity
8.3 High (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: github.com/siyuan-note/siyuan/kernel: 3.6.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-56cv-c5p2-j2wg (opens a new tab)

What happened

Summary

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.

Affected Code

File: /kernel/api/network.go (Lines 153-317)

Continue reading
func forwardProxy(c *gin.Context) {
 ret := gulu.Ret.NewResult()
 defer c.JSON(http.StatusOK, ret)

 arg, ok := util.JsonArg(c, ret)
 if !ok {
 return
 }

 destURL := arg["url"].(string)
 // VULNERABILITY: Only validates URL format, not destination
 if _, e := url.ParseRequestURI(destURL); nil != e {
 ret.Code = -1
 ret.Msg = "invalid [url]"
 return
 }

 // ... HTTP request is made to user-controlled URL ...
 resp, err := request.Send(method, destURL)
 
 // Full response body is returned to the user
 bodyData, err := io.ReadAll(resp.Body)
 // ...
 ret.Data = data // Contains full response body
}

PoC

- First, authenticate with your access auth code and copy the authenticated cookie. - Now use the request below for SSRF to Access Cloud Metadata.

POST /api/network/forwardProxy HTTP/1.1
Host: 
Cookie: siyuan= 
Content-Length: 102

{"url":"http://169.254.169.254/metadata/v1/","method":"GET","headers":[],"payload":"","timeout":7000}'

Impact

- Internal Network Reconnaissance: Attackers can scan internal services - Cloud Credential Theft: Potential access to cloud metadata and IAM credentials - Data Exfiltration: Server can be used as a proxy to access internal resources - Firewall Bypass: Requests originate from trusted internal IP

Affected package ranges reported by GitHub: github.com/siyuan-note/siyuan/kernel: <= 3.5.9

Scores and how they were measured

CVSS base severity

8.3

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-56cv-c5p2-j2wg (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-56cv-c5p2-j2wg, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 5). SiYuan has a Full-Read SSRF via /api/network/forwardProxy (CVE-2026-32110). https://kevwire.com/record/CVE-2026-32110

MLA

"SiYuan has a Full-Read SSRF via /api/network/forwardProxy (CVE-2026-32110)." KEVWire, 5 Nov. 2026, kevwire.com/record/CVE-2026-32110.

Chicago

KEVWire. "SiYuan has a Full-Read SSRF via /api/network/forwardProxy (CVE-2026-32110)." Last modified November 5, 2026. https://kevwire.com/record/CVE-2026-32110.

Evidence summary (plain text)

SiYuan has a Full-Read SSRF via /api/network/forwardProxy (Mar 12, 2026).
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.

File: /kernel/api/network.go (Lines 153-317)

- First, authenticate with your access auth code and copy the authenticated cookie.
- Now use the request below for SSRF to Access Cloud Metadata.
CVSS 8.3 (version 3.1; evidence as of Nov 5, 2026; https://github.com/advisories/GHSA-56cv-c5p2-j2wg).
Sources:
GitHub-reviewed advisory GHSA-56cv-c5p2-j2wg: https://github.com/advisories/GHSA-56cv-c5p2-j2wg
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-32110.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 5, 2026, 22:25 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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