Vulnerability-Lookup

CVE-2026-40318 (GCVE-0-2026-40318)

Vulnerability from cvelistv5 – Published: 2026-04-16 22:54 – Updated: 2026-04-18 02:48

Title

SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`

Summary

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and prior, the /api/av/removeUnusedAttributeView endpoint constructs a filesystem path using the user-controlled id parameter without validation or path boundary enforcement. An attacker can inject path traversal sequences such as ../ into the id value to escape the intended directory and delete arbitrary .json files on the server, including global configuration files and workspace metadata. This issue has been fixed in version 3.6.4.

Severity

8.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-18 02:48 UTC

CWE

CWE-24 - Path Traversal: '../filedir'

Assigner

GitHub_M mitre root

References

2 references

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

Impacted products

1 product

Vendor	Product	Version	CPE status
siyuan-note	siyuan	Affected: < 3.6.4	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-40318

Vulnerability from fkie_nvd - Published: 2026-04-16 23:16 - Updated: 2026-06-17 10:45

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4	Release Notes
	security-advisories@github.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4	Third Party Advisory

Impacted products

	Vendor	Product	Version
	b3log	siyuan	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "siyuan",
          "vendor": "siyuan-note",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.6.4"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3951F8B9-C26F-4A2E-98FB-F744EB1F67B8",
              "versionEndExcluding": "3.6.4",
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    }
  ],
  "id": "CVE-2026-40318",
  "lastModified": "2026-06-17T10:45:01.090",
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          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
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          "userInteraction": "NONE",
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GHSA-VW86-C94W-V3X4

Vulnerability from github – Published: 2026-04-10 19:32 – Updated: 2026-04-24 20:36

Summary

SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`

Details

Summary

The endpoint /api/av/removeUnusedAttributeView is vulnerable to a path traversal (CWE-22) that allows an attacker to delete arbitrary .json files on the server.

The issue arises because user-controlled input (id) is directly used in filesystem path construction without validation or restriction.

Access to this endpoint (e.g., via a Reader-role or publish context) is considered a precondition and not part of the vulnerability. The root cause is unsafe path handling.

Steps To Reproduce

Ensure the target instance has the publish service enabled (or any valid access to the endpoint).
Send the following request:

POST /api/av/removeUnusedAttributeView HTTP/1.1
Host: <target>
Content-Type: application/json

{
  "id": "../../../conf/conf"
}

Observe that the request is accepted.
The server resolves the path outside the intended directory and deletes the target file.

Impact

An attacker can delete arbitrary .json files within the workspace directory.

This may lead to:

Deletion of global configuration files (e.g., conf/conf.json)
Loss of user data and application state
Corruption of workspace metadata
Persistent application instability or forced recovery

This represents a server-side arbitrary file deletion primitive, which can have severe impact depending on the targeted files.

Technical Details

The vulnerable code constructs file paths as follows:

filepath.Join(util.DataDir, "storage", "av", id+".json")

Because id is not validated, attackers can inject path traversal sequences such as ../ to escape the intended directory.

Example payloads

../local → data/storage/local.json
../../storage/outline → data/storage/outline.json
../../../conf/conf → conf/conf.json

No validation or restriction is applied to:

input format
path normalization
directory boundaries

Root Cause

Untrusted user input (id) is directly used in filesystem path construction
No input validation or sanitization
No enforcement that the resolved path stays within the intended directory

Remediation

Validate input strictly
Only allow valid Attribute View IDs
Reject any input containing path traversal sequences
Enforce directory boundaries

base := filepath.Join(util.DataDir, "storage", "av")
absPath := filepath.Join(base, id+".json")

if !util.IsSubPath(base, absPath) {
    return error
}

Normalize paths before use
Ensure canonical paths cannot escape the base directory
Add additional logical checks
Verify that the target object is valid and allowed to be deleted

Severity

8.5 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 0.0.0-20260407035653-2f416e5253f1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.40.0.0-20260407035653-2f416e5253f1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40318"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-24"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-10T19:32:12Z",
    "nvd_published_at": "2026-04-16T23:16:33Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe endpoint `/api/av/removeUnusedAttributeView` is vulnerable to a **path traversal (CWE-22)** that allows an attacker to delete arbitrary `.json` files on the server.\n\nThe issue arises because user-controlled input (`id`) is directly used in filesystem path construction without validation or restriction.\n\n\u003e Access to this endpoint (e.g., via a Reader-role or publish context) is considered a precondition and not part of the vulnerability. The root cause is unsafe path handling.\n\n---\n\n## Steps To Reproduce\n\n1. Ensure the target instance has the publish service enabled (or any valid access to the endpoint).\n2. Send the following request:\n\n```http\nPOST /api/av/removeUnusedAttributeView HTTP/1.1\nHost: \u003ctarget\u003e\nContent-Type: application/json\n\n{\n  \"id\": \"../../../conf/conf\"\n}\n```\n\n3. Observe that the request is accepted.\n4. The server resolves the path outside the intended directory and deletes the target file.\n\n---\n\n## Impact\n\nAn attacker can delete arbitrary `.json` files within the workspace directory.\n\nThis may lead to:\n\n* Deletion of global configuration files (e.g., `conf/conf.json`)\n* Loss of user data and application state\n* Corruption of workspace metadata\n* Persistent application instability or forced recovery\n\nThis represents a **server-side arbitrary file deletion primitive**, which can have severe impact depending on the targeted files.\n\n---\n\n## Technical Details\n\nThe vulnerable code constructs file paths as follows:\n\n```go\nfilepath.Join(util.DataDir, \"storage\", \"av\", id+\".json\")\n```\n\nBecause `id` is not validated, attackers can inject path traversal sequences such as `../` to escape the intended directory.\n\n### Example payloads\n\n* `../local` \u2192 `data/storage/local.json`\n* `../../storage/outline` \u2192 `data/storage/outline.json`\n* `../../../conf/conf` \u2192 `conf/conf.json`\n\nNo validation or restriction is applied to:\n\n* input format\n* path normalization\n* directory boundaries\n\n---\n\n## Root Cause\n\n* Untrusted user input (`id`) is directly used in filesystem path construction\n* No input validation or sanitization\n* No enforcement that the resolved path stays within the intended directory\n\n---\n\n## Remediation\n\n1. **Validate input strictly**\n\n   * Only allow valid Attribute View IDs\n   * Reject any input containing path traversal sequences\n\n2. **Enforce directory boundaries**\n\n```go\nbase := filepath.Join(util.DataDir, \"storage\", \"av\")\nabsPath := filepath.Join(base, id+\".json\")\n\nif !util.IsSubPath(base, absPath) {\n    return error\n}\n```\n\n3. **Normalize paths before use**\n\n   * Ensure canonical paths cannot escape the base directory\n\n4. **Add additional logical checks**\n\n   * Verify that the target object is valid and allowed to be deleted\n\n---",
  "id": "GHSA-vw86-c94w-v3x4",
  "modified": "2026-04-24T20:36:55Z",
  "published": "2026-04-10T19:32:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40318"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`"
}

Sightings

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Action not permitted

CVE-2026-40318 (GCVE-0-2026-40318)

FKIE_CVE-2026-40318

GHSA-VW86-C94W-V3X4

Summary

Steps To Reproduce

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