{"id":"GHSA-f72r-2h5j-7639","summary":"SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal","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`","aliases":["CVE-2026-25992","GO-2026-4386"],"modified":"2026-02-10T20:02:49.558019Z","published":"2026-01-28T23:00:57Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-01-28T23:00:57Z","nvd_published_at":"2026-02-10T18:16:38Z","cwe_ids":["CWE-178","CWE-22","CWE-426"]},"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"}],"affected":[{"package":{"name":"github.com/siyuan-note/siyuan/kernel","ecosystem":"Go","purl":"pkg:golang/github.com/siyuan-note/siyuan/kernel"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.0.0-20260126094835-d5d10dd41b0c"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-f72r-2h5j-7639/GHSA-f72r-2h5j-7639.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"CVSS_V4","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"}]}