SiYuan has a File Read Interface Case Bypass Vulnerability
Priority HIGH 72CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure, Code execution
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22, CWE-426 and the CVSS impact.
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00601 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed siyuan (siyuan-note): 3.5.5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| siyuan-note | siyuan | before 3.5.5 | 3.5.5 | Patch available | CNA |
| — | github.com/siyuan-note/siyuan/kernel (Go) | up to 0.0.0-20260126094835-d5d10dd41b0c | — | No fix listed | GHSA-f72r-2h5j-7639 |
- siyuan Vendorsiyuan-note Affected before 3.5.5 Fixed in 3.5.5 Patch available CNA
- github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected up to 0.0.0-20260126094835-d5d10dd41b0c Fixed in — No fix listed GHSA-f72r-2h5j-7639
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* | before 3.5.5 | Vulnerable | siyuan-note |
- cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.5.5 Vulnerable ·siyuan-note
Remediation
- Fix · CNA siyuan (siyuan-note) Fixed in 3.5.5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-25992
- 2026-10-03 Alias added: GHSA-f72r-2h5j-7639
- 2026-10-25 EPSS moved to the below the 50th percentile
References
More siyuan-note Siyuan vulnerabilities
- TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
- TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8
- TI-2024-35827 A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. CVSS 3.1CRITICAL 9.8
- TI-2024-35826 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. CVSS 3.1CRITICAL 9.8
- TI-2024-35825 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. CVSS 3.1CRITICAL 9.8
- TI-2024-35824 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-25992 · CVE Program
- CVE-2026-25992 · NVD
- FIRST EPSS
- GHSA-f72r-2h5j-7639 · GitHub Advisory Database · CC BY 4.0
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