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Vulnerabilities

Vulnerability · CVE-2026-31807

SiYuan is a personal knowledge management system.

Published Mar 10, 2026 · catalog updated Jun 17, 2026 · SiYuan is a personal

Check if you run it

No confirmed exploitation is on record for CVE-2026-31807. EPSS is 0.50%. Act only if a listed version of SiYuan is a personal is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SiYuan is a personal).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.50%
Remediation
Advisory link
Affected products
cpe b3log/siyuan

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe b3log/siyuanversion unspecified

How to fix CVE-2026-31807

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-31807. EPSS is 0.50%. Act only if a listed version of SiYuan is a personal is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.50%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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.

  1. 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

  2. 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

Sources

  • CVE.orgVulnerability recordCVE-2026-31807

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31807

    30-day exploitation probability 0.5%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.