Cross-site scripting in SiYuan via check-auth to parameter
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
SiYuan from 2.9.0 before 3.8.7 contains a cross-site scripting flaw (CWE-79) in the unauthenticated /check-auth page, which assigns the to parameter to window.location.href without validating the URL scheme. A remote attacker can send a crafted link with a javascript: URI that runs after the victim logs in, where it can call kernel APIs to read or modify workspace content and settings. Exploitation requires the victim to open the link and has high attack complexity.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
Description from the CNA
SiYuan from 2.9.0 before 3.8.7 contains a cross-site scripting vulnerability in the unauthenticated /check-auth page that assigns the to parameter to window.location.href without scheme validation. Attackers can send a crafted link with a javascript: URI that executes after victim login, invoking kernel APIs to read or modify workspace content and settings.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
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 | 2.9.0 to before 3.8.7 | 3.8.7 | Patch available | CNA |
- siyuan Vendorsiyuan-note Affected 2.9.0 to before 3.8.7 Fixed in 3.8.7 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* | — | — | siyuan-note |
- cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions — — ·siyuan-note
Remediation
Upgrade SiYuan to version 3.8.7 or later, which fixes the issue.
Written with Claude Haiku 5.5 from the sources below · 2026-11-05
- Fix · CNA siyuan (siyuan-note) Fixed in 3.8.7
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
siyuan-note siyuan 3.8.7
6 records Highest priority Priority HIGH 1 HIGH, 3 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2026-80184 Cleartext transmission in SiYuan exposes login and session cookiesPriority HIGH 68
- TI-2026-80188 SQL injection in SiYuan history search exposes history.dbPriority MEDIUM 64
- TI-2026-80186 Path traversal in SiYuan MCP asset tool lets attackers read local filesPriority MEDIUM 64
Timeline
- 2026-10-25 Threatist record created from CVE-2026-116167
- 2026-10-26 CISA SSVC decision points changed
- 2026-10-26 Priority changed: MEDIUM → LOW
- 2026-10-27 Alias added: GHSA-jvrf-pm5c-jgr4
- 2026-10-29 EPSS moved to the 50th–90th percentile
References
More siyuan-note vulnerabilities
- TI-2026-48492 SiYuan before v3.7.3 SQL Injection via searchDocs CVSS 4.0CRITICAL 9.9
- TI-2026-48491 SiYuan before v3.7.3 SQL Injection via searchEmbedBlock CVSS 4.0CRITICAL 9.9
- TI-2026-48490 SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent CVSS 4.0CRITICAL 9.9
- TI-2026-47010 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP CVSS 4.0CRITICAL 10.0
- 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
Sources
- CVE-2026-116167 · CVE Program
- CVE-2026-116167 · NVD
- FIRST EPSS
- GHSA-jvrf-pm5c-jgr4 · GitHub Advisory Database · CC BY 4.0
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