Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

CVE-2026-31807SiYuan has a SVG Sanitizer Bypass via `<animate>` Element — Unauthenticated XSS

Medium 6.4

In plain English

A medium-severity cross-site scripting in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.4Medium

Exploit odds (30 days)0.5%top 57.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Nuclei

Official description

SiYuan is a personal knowledge management system. Prior to 3.5.10, SiYuan's SVG sanitizer (SanitizeSVG) blocks dangerous elements (<script>, <iframe>, <foreignobject>) and removes on* event handlers and javascript: in href attributes. However, it does NOT block SVG animation elements (<animate>, <set>) 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260310025236-297bd526708f	GHSA-5hc8-qmg8-pw27
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260310025236-297bd526708f	GO-2026-4667

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	< 3.5.10

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5hc8-qmg8-pw27 x_refsource_CONFIRM