GHSA-F72R-2H5J-7639

Vulnerability from github – Published: 2026-01-28 23:00 – Updated: 2026-02-10 19:56
VLAI?
Summary
SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal
Details

File Read Interface Case Bypass Vulnerability

Vulnerability Name

File Read Interface Case Bypass Vulnerability

Overview

The /api/file/getFile endpoint uses case-sensitive string equality checks to block access to sensitive files. On case-insensitive file systems such as Windows, attackers can bypass restrictions using mixed-case paths and read protected configuration files.

Impact

  • Read sensitive information in configuration files (e.g., access codes, API Tokens, sync configurations, etc.).
  • Remotely exploitable directly when the service is published without authentication.

Trigger Conditions

  • Running on a case-insensitive file system.
  • The caller can access /api/file/getFile (via CheckAuth or Token injection in published services).

PoC (Generic Example)

After enabling publication:

Request:

POST /api/file/getFile
Content-Type: application/json

{"path":"cOnf/conf.json"}

Expected Result: - Successfully return the content of the configuration file.

Root Cause

Path comparison uses strict case-sensitive string matching, without case normalization or identical file validation.

Fix Recommendations

  • Normalize path casing before comparison (Windows/macOS).
  • Use file-level comparison methods such as os.SameFile.
  • Apply blacklist validation on sensitive paths after case normalization.

Notes

  • Environment identifiers and sensitive information have been removed.

Solution Commit

399a38893e8719968ea2511e177bb53e09973fa6

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.0.0-20260126094835-d5d10dd41b0c"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25992"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-178",
      "CWE-22",
      "CWE-426"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-28T23:00:57Z",
    "nvd_published_at": "2026-02-10T18:16:38Z",
    "severity": "HIGH"
  },
  "details": "# File Read Interface Case Bypass Vulnerability\n## Vulnerability Name\nFile Read Interface Case Bypass Vulnerability\n\n## Overview\nThe `/api/file/getFile` endpoint uses **case-sensitive string equality checks** to block access to sensitive files.\nOn case-insensitive file systems such as **Windows**, attackers can bypass restrictions using mixed-case paths\nand read protected configuration files.\n\n## Impact\n- Read sensitive information in configuration files (e.g., access codes, API Tokens, sync configurations, etc.).\n- Remotely exploitable directly when the service is published without authentication.\n\n## Trigger Conditions\n- Running on a **case-insensitive file system**.\n- The caller can access `/api/file/getFile` (via CheckAuth or Token injection in published services).\n\n## PoC (Generic Example)\nAfter enabling publication:\n\n**Request:**\n```http\nPOST /api/file/getFile\nContent-Type: application/json\n\n{\"path\":\"cOnf/conf.json\"}\n```\n\n**Expected Result:**\n- Successfully return the content of the configuration file.\n\n## Root Cause\nPath comparison uses strict case-sensitive string matching, without case normalization or identical file validation.\n\n## Fix Recommendations\n- Normalize path casing before comparison (Windows/macOS).\n- Use file-level comparison methods such as `os.SameFile`.\n- Apply blacklist validation on sensitive paths **after case normalization**.\n\n## Notes\n- Environment identifiers and sensitive information have been removed.\n\n## Solution Commit\n`399a38893e8719968ea2511e177bb53e09973fa6`",
  "id": "GHSA-f72r-2h5j-7639",
  "modified": "2026-02-10T19:56:53Z",
  "published": "2026-01-28T23:00:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f72r-2h5j-7639"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25992"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/1f02650b3892d2ea3896242dd2422c30bda55e11"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.5.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.



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