CVE-2026-31807
SiYuan is a personal knowledge management system.
Published Mar 10, 2026 · corrected/updated Jun 17, 2026 · b3log siyuan · evidence confidence medium
SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements ( , , ) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements ( , ) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject executable JavaScript into the unauthenticated /api/icon/getDynamicIcon endpoint (type=8), creating a reflected XSS. This is a bypass of the fix for CVE-2026-29183 (fixed in v3.5.9). This vulnerability is fixed in v3.5.10.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-31807 is a medium public vulnerability record for b3log siyuan. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether b3log siyuan is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: b3log/siyuan. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 6.4. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-79. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 10, 2026 · NIST NVD
Detected
SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements ( , , ) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements ( , ) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject e
Jun 17, 2026 · NIST NVD
Updated
SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements ( , , ) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements ( , ) which can dynamically set attributes to dangerous values at runtime, bypassing the static sanitization. This allows an attacker to inject e
Affected
- cpe b3log/siyuanversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-31807
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-31807
SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements ( , , ) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elem
nvd.nist.gov