Vulnerability-Lookup

CVE-2026-34585 (GCVE-0-2026-34585)

Vulnerability from cvelistv5 – Published: 2026-03-31 21:47 – Updated: 2026-04-01 13:34

Title

SiYuan: Stored XSS in imported .sy.zip content leads to arbitrary command execution

Summary

SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.

Severity ?

8.6 (High)


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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/siyuan-note/siyuan/security/ad…	x_refsource_CONFIRM
	https://github.com/siyuan-note/siyuan/issues/17246	x_refsource_MISC
	https://github.com/siyuan-note/siyuan/releases/ta…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	siyuan-note	siyuan	Affected: < 3.6.2

Show details on NVD website

JSON

To clipboard

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GHSA-FF66-236V-P4FG

Vulnerability from github – Published: 2026-04-01 00:05 – Updated: 2026-04-01 00:05

Summary

SiYuan Desktop: Stored XSS in imported .sy.zip content leads to arbitrary command execution

Details

Summary

A vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs.

Details

The issue is caused by a logic regression in escapeNodeAttributeValues in kernel/filesys/tree.go. Previously, the escaping logic converted node.KramdownIAL with parse.IAL2Map(...) before deciding whether a value needed escaping. That conversion unescaped existing entities first, so mixed values such as:

&amp;" onmouseenter="alert('IAL-XSS')

were still recognized as unsafe and escaped correctly. The logic changed to inspect raw KramdownIAL values directly. The new needsEscapeForValue implementation returns false as soon as it sees any known entity such as &, ", <, or >. This means a value containing both an entity and an unescaped raw quote bypasses escaping entirely.

That bypass becomes exploitable because the renderer later inserts block IAL values directly into HTML attributes. A payload like:

&amp;" onmouseenter="require('child_process').exec('calc')

can be rendered into HTML equivalent to:

<div title="&amp;" onmouseenter="require('child_process').exec('calc')">

This creates a stored XSS condition. In SiYuan Desktop, the Electron renderer runs with Node.js integration available, so attacker-controlled JavaScript can invoke Node APIs directly. As a result, the issue is not limited to script execution in the page context and becomes arbitrary command execution on the victim’s machine.

The stored XSS path was validated by importing a crafted .sy.zip through the normal GUI and triggering JavaScript execution from the rendered block. Because the same injected JavaScript runs in the privileged Electron renderer, this is an RCE issue in the desktop client.

PoC

Start SiYuan Desktop v3.6.1.
Prepare a crafted .sy.zip containing a .sy document with a block IAL property such as:

"title": "&amp;\" onmouseenter=\"require('child_process').exec('calc')"

In the UI, right-click any notebook.
Select Import -> SiYuan .sy.zip.
Import the crafted archive.
Open the imported note.
Move the mouse over the affected paragraph block.
Observe that the injected JavaScript executes.
On Windows, calc.exe launches, demonstrating arbitrary command execution.

Impact

This vulnerability allows an attacker to deliver a malicious .sy.zip file that executes attacker-controlled JavaScript after import. In the desktop application, that JavaScript runs with Node/Electron privileges and can execute arbitrary operating system commands under the victim’s account. This makes the bug equivalent to local code execution triggered by importing and opening attacker-supplied content.

Severity ?

8.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260329142331-918d1bd9f967"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-34585"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-01T00:05:11Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nA vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a `.sy` document, package it as a `.sy.zip`, and have the victim import it through the normal `Import -\u003e SiYuan .sy.zip` workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs.\n\n### Details\nThe issue is caused by a logic regression in `escapeNodeAttributeValues` in `kernel/filesys/tree.go`.\nPreviously, the escaping logic converted `node.KramdownIAL` with `parse.IAL2Map(...)` before deciding whether a value needed escaping. That conversion unescaped existing entities first, so mixed values such as:\n```\n\u0026amp;\" onmouseenter=\"alert(\u0027IAL-XSS\u0027)\n```\nwere still recognized as unsafe and escaped correctly.\nThe logic changed to inspect raw `KramdownIAL` values directly. The new `needsEscapeForValue` implementation returns `false` as soon as it sees any known entity such as `\u0026amp;`, `\u0026quot;`, `\u0026lt;`, or `\u0026gt;`. This means a value containing both an entity and an unescaped raw quote bypasses escaping entirely.\n\nThat bypass becomes exploitable because the renderer later inserts block IAL values directly into HTML attributes. A payload like:\n```\n\u0026amp;\" onmouseenter=\"require(\u0027child_process\u0027).exec(\u0027calc\u0027)\n```\ncan be rendered into HTML equivalent to:\n```\n\u003cdiv title=\"\u0026amp;\" onmouseenter=\"require(\u0027child_process\u0027).exec(\u0027calc\u0027)\"\u003e\n```\nThis creates a stored XSS condition. In SiYuan Desktop, the Electron renderer runs with Node.js integration available, so attacker-controlled JavaScript can invoke Node APIs directly. As a result, the issue is not limited to script execution in the page context and becomes arbitrary command execution on the victim\u2019s machine.\n\nThe stored XSS path was validated by importing a crafted `.sy.zip` through the normal GUI and triggering JavaScript execution from the rendered block. Because the same injected JavaScript runs in the privileged Electron renderer, this is an RCE issue in the desktop client.\n\n### PoC\n1. Start SiYuan Desktop `v3.6.1`.\n2. Prepare a crafted `.sy.zip` containing a .sy document with a block IAL property such as:\n```\n\"title\": \"\u0026amp;\\\" onmouseenter=\\\"require(\u0027child_process\u0027).exec(\u0027calc\u0027)\"\n```\n3. In the UI, right-click any notebook.\n4. Select `Import -\u003e SiYuan .sy.zip`.\n5. Import the crafted archive.\n6. Open the imported note.\n7. Move the mouse over the affected paragraph block.\n8. Observe that the injected JavaScript executes.\n9. On Windows, `calc.exe` launches, demonstrating arbitrary command execution.\n\n### Impact\nThis vulnerability allows an attacker to deliver a malicious `.sy.zip` file that executes attacker-controlled JavaScript after import. In the desktop application, that JavaScript runs with Node/Electron privileges and can execute arbitrary operating system commands under the victim\u2019s account. This makes the bug equivalent to local code execution triggered by importing and opening attacker-supplied content.",
  "id": "GHSA-ff66-236v-p4fg",
  "modified": "2026-04-01T00:05:11Z",
  "published": "2026-04-01T00:05:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/918d1bd9f967d888f474f6764744a3d8cca4a501"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan Desktop: Stored XSS in imported .sy.zip content leads to arbitrary command execution"
}

FKIE_CVE-2026-34585

Vulnerability from fkie_nvd - Published: 2026-03-31 22:16 - Updated: 2026-04-03 16:52

Severity ?

8.6 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
8.2 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/siyuan-note/siyuan/issues/17246	Issue Tracking
security-advisories@github.com	https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2	Release Notes
security-advisories@github.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	b3log	siyuan	*

JSON

To clipboard

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    {
      "lang": "en",
      "value": "SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -\u003e SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2."
    },
    {
      "lang": "es",
      "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. Antes de la versi\u00f3n 3.6.2, una vulnerabilidad permite que valores de atributos de bloque manipulados eludan el escape de atributos del lado del servidor cuando una entidad HTML se mezcla con caracteres especiales sin procesar. Un atacante puede incrustar un valor IAL malicioso dentro de un documento .sy, empaquetarlo como un .sy.zip, y hacer que la v\u00edctima lo importe a trav\u00e9s del flujo de trabajo normal de Importar -\u0026gt; SiYuan .sy.zip. Una vez que se abre la nota, el atributo malicioso sale de su contexto HTML original e inyecta un gestor de eventos, resultando en XSS almacenado. En el cliente de escritorio Electron, este XSS alcanza la ejecuci\u00f3n remota de c\u00f3digo porque el JavaScript inyectado se ejecuta con acceso a las API de Node/Electron. Este problema ha sido parcheado en la versi\u00f3n 3.6.2."
    }
  ],
  "id": "CVE-2026-34585",
  "lastModified": "2026-04-03T16:52:22.293",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 6.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.5,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-31T22:16:22.080",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://github.com/siyuan-note/siyuan/issues/17246"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-94"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-34585 (GCVE-0-2026-34585)

GHSA-FF66-236V-P4FG

Summary

Details

PoC

Impact

FKIE_CVE-2026-34585

Tags

Sightings

Nomenclature