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Response snapshot Nov 5, 2026, 22:51 UTC

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VulnerabilityCVE-2026-30869

SiYuan Vulnerable to Path Traversal in /export Endpoint Allows Arbitrary File Read and Secret Leakage

A path traversal vulnerability in the /export endpoint allows an attacker to read arbitrary files from the server filesystem. By exploiting double‑encoded traversal sequences, an attacker can access sensitive files such as conf/conf.

Published Updated

At a glance

Exploited
Not known
Severity
9.3 Critical (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: 3.5.10. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-2h2p-mvfx-868w (opens a new tab)

What happened

Summary

A path traversal vulnerability in the /export endpoint allows an attacker to read arbitrary files from the server filesystem. By exploiting double‑encoded traversal sequences, an attacker can access sensitive files such as conf/conf.json, which contains secrets including the API token, cookie signing key, and workspace access authentication code.

Leaking these secrets may enable administrative access to the SiYuan kernel API, and in certain deployment scenarios could potentially be chained into remote code execution (RCE).

Details

Continue reading

File: [serve.go](app://-/index.html?hostId=local#), [session.go](app://-/index.html?hostId=local#) Lines: serve.go 303, 315, 320, 340, 955-957; session.go 292-295

Vulnerable Code:

// session.go
if localhost {
 if strings.HasPrefix(c.Request.RequestURI, "/assets/") || strings.HasPrefix(c.Request.RequestURI, "/export/") {
 c.Set(RoleContextKey, RoleAdministrator)
 c.Next()
 return
 }
}

// serve.go
filePath := strings.TrimPrefix(c.Request.URL.Path, "/export/")
decodedPath, err := url.PathUnescape(filePath)
fullPath := filepath.Join(exportBaseDir, decodedPath)
c.File(fullPath)

// CORS
c.Header("Access-Control-Allow-Origin", "*")

Points of Vulnerability:

- /export/* trusts url.PathUnescape output and joins it without enforcing fullPath to stay under exportBaseDir. - Double-encoded traversal (%252e%252e) bypasses ServeFile dot-dot URL rejection but is decoded by app logic into ... - CheckAuth grants admin for localhost requests to /export/* when access auth code is set. - Global CORS Access-Control-Allow-Origin: * allows hostile web pages to read localhost responses.

PoC

Reproduction Steps:

1. Send a GET request to /export/%252e%252e/%252e%252e/conf/conf.json or export/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd

2. If HTTP 200 is returned, inspect the response body for sensitive fields:

api.token
cookieKey
accessAuthCode

or

/etc/passwd

3. (Optional) If api.token is present, test admin API access:

POST /api/system/getNetwork
Header: Authorization: Token

4. Confirm that the response indicates administrative privileges. All steps can be performed with read-only HTTP requests; no Docker or local modifications are needed.

Impact

This vulnerability can lead to serious compromise of a SiYuan instance, including:

Arbitrary File Disclosure - Attackers can read files anywhere on the server filesystem, including system files such as /etc/passwd.

Exposure of Sensitive Secrets - Configuration files such as conf/conf.json contain sensitive information including: - API tokens - cookie signing keys - workspace authentication codes

Administrative API Access - Leaked tokens can allow attackers to interact with privileged SiYuan kernel APIs.

Cross‑Origin Localhost Data Exfiltration - Because the server sets Access-Control-Allow-Origin: *, a malicious website can exploit the vulnerability to read files from a victim's local SiYuan instance running on 127.0.0.1.

Potential Remote Code Execution (RCE) - Disclosure of authentication secrets and internal configuration may enable attackers to chain this vulnerability with other application features or APIs to achieve remote code execution or full system compromise.

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

Scores and how they were measured

CVSS base severity

9.3

Version 3.1As of

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

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Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-2h2p-mvfx-868w (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-2h2p-mvfx-868w, 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 Vulnerable to Path Traversal in /export Endpoint Allows Arbitrary File Read and Secret Leakage (CVE-2026-30869). https://kevwire.com/record/CVE-2026-30869

MLA

"SiYuan Vulnerable to Path Traversal in /export Endpoint Allows Arbitrary File Read and Secret Leakage (CVE-2026-30869)." KEVWire, 5 Nov. 2026, kevwire.com/record/CVE-2026-30869.

Chicago

KEVWire. "SiYuan Vulnerable to Path Traversal in /export Endpoint Allows Arbitrary File Read and Secret Leakage (CVE-2026-30869)." Last modified November 5, 2026. https://kevwire.com/record/CVE-2026-30869.

Evidence summary (plain text)

SiYuan Vulnerable to Path Traversal in /export Endpoint Allows Arbitrary File Read and Secret Leakage (Mar 7, 2026).
A path traversal vulnerability in the /export endpoint allows an attacker to read arbitrary files from the server filesystem. By exploiting double‑encoded traversal sequences, an attacker can access sensitive files such as conf/conf.json, which contains secrets including the API token, cookie signing key, and workspace access authentication code.

Leaking these secrets may enable administrative access to the SiYuan kernel API, and in certain deployment scenarios could potentially be chained into remote code execution (RCE).
CVSS 9.3 (version 3.1; evidence as of Nov 5, 2026; https://github.com/advisories/GHSA-2h2p-mvfx-868w).
Sources:
GitHub-reviewed advisory GHSA-2h2p-mvfx-868w: https://github.com/advisories/GHSA-2h2p-mvfx-868w
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-30869.
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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