{"id":"CVE-2026-25992","aliases":["EUVD-2026-6758","GHSA-f72r-2h5j-7639","GO-2026-4386"],"status":"published","title":"SiYuan has a File Read Interface Case Bypass Vulnerability","description":"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":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00601,"percentile":0.49031,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-178","CWE-22","CWE-426"],"published":"2026-01-28T23:00:57Z","modified":"2026-10-28T02:31:05Z","affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/siyuan-note/siyuan/kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.0.0-20260126094835-d5d10dd41b0c"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/siyuan-note/siyuan/kernel","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"0.0.0-20260126094835-d5d10dd41b0c"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/siyuan-note/siyuan/kernel","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]}],"products":[{"vendor":"b3log","product":"siyuan"},{"vendor":"siyuan-note","product":"siyuan"}],"references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f72r-2h5j-7639","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/siyuan-note/siyuan/releases/tag/v3.5.5","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://github.com/siyuan-note/siyuan/commit/1f02650b3892d2ea3896242dd2422c30bda55e11","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25992","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-f72r-2h5j-7639"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25992.json","tags":["advisory"]},{"url":"https://github.com/siyuan-note/siyuan","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-25992","title":"SiYuan has a File Read Interface Case Bypass Vulnerability","description":"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.","status":"published","published":"2026-02-10T17:47:36.041Z","modified":"2026-02-10T19:17:41.722Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T13:41:30.911526Z"}],"euvd":[{"id":"EUVD-2026-6758","description":"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.","status":"published","published":"2026-02-10T17:47:36Z","modified":"2026-02-10T19:17:41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T19:48:41.699812Z"}],"ghsa":[{"id":"GHSA-f72r-2h5j-7639","title":"SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal","description":"# 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`","status":"published","published":"2026-01-28T23:00:57Z","modified":"2026-02-10T19:56:57Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22","CWE-178","CWE-426"],"updated_at":"2026-11-02T14:39:24.742346Z"}],"nvd":[{"id":"CVE-2026-25992","description":"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.","status":"published","published":"2026-02-10T18:16:38.807Z","modified":"2026-06-17T10:25:33.633Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:05.908608Z"}],"osv":[{"id":"CVE-2026-25992","title":"SiYuan has a File Read Interface Case Bypass Vulnerability","description":"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.","status":"published","published":"2026-02-10T17:47:36.041Z","modified":"2026-10-28T02:31:05.088856443Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:44:59.80315Z"},{"id":"GHSA-f72r-2h5j-7639","title":"SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal","description":"# 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`","status":"published","published":"2026-01-28T23:00:57Z","modified":"2026-02-10T20:02:49.558019Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"},{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-178","CWE-22","CWE-426"],"updated_at":"2026-11-02T15:46:46.006631Z"},{"id":"GO-2026-4386","title":"SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal in github.com/siyuan-note/siyuan/kernel","description":"SiYuan File Read API Case Sensitivity Bypass can Lead to Path Traversal in github.com/siyuan-note/siyuan/kernel","status":"published","published":"2026-02-02T21:05:59Z","modified":"2026-02-10T16:41:24.624026Z","updated_at":"2026-11-02T15:47:02.011123Z"}]}}