CVE-2026-25992 (GCVE-0-2026-25992)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:47 – Updated: 2026-02-10 19:17

Title

SiYuan has a File Read Interface Case Bypass Vulnerability

Summary

SiYuan is a personal knowledge management system. Prior to 3.5.5, 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. This vulnerability is fixed in 3.5.5.

Severity ?

7.5 (High)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M

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

	Vendor	Product	Version
	siyuan-note	siyuan	Affected: < 3.5.5

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25992

Vulnerability from fkie_nvd - Published: 2026-02-10 18:16 - Updated: 2026-02-10 21:51

Severity ?

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/siyuan-note/siyuan/releases/tag/v3.5.5
	security-advisories@github.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f72r-2h5j-7639

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SiYuan is a personal knowledge management system. Prior to 3.5.5, 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. This vulnerability is fixed in 3.5.5."
    }
  ],
  "id": "CVE-2026-25992",
  "lastModified": "2026-02-10T21:51:48.077",
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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GHSA-F72R-2H5J-7639

Vulnerability from github – Published: 2026-01-28 23:00 – Updated: 2026-02-10 19:56

Summary

SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal

Details

File Read Interface Case Bypass Vulnerability

Vulnerability Name

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

Show details on source website

JSON

To clipboard

{
  "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"
}

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-2026-25992 (GCVE-0-2026-25992)

FKIE_CVE-2026-25992

GHSA-F72R-2H5J-7639

File Read Interface Case Bypass Vulnerability

Vulnerability Name

Overview

Impact

Trigger Conditions

PoC (Generic Example)

Root Cause

Fix Recommendations

Notes

Solution Commit

Tags

Sightings

Nomenclature