EUVD-2026-17687
GHSA-73g7-86qr-jrg3
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionGitHub Advisory
SiYuan is a personal knowledge management system. From version 3.6.0 to before version 3.6.2, the SanitizeSVG function introduced in version 3.6.0 to fix XSS in the unauthenticated /api/icon/getDynamicIcon endpoint can be bypassed by using namespace-prefixed element names such as <x:script xmlns:x="http://www.w3.org/2000/svg">. The Go HTML5 parser records the element's tag as "x:script" rather than "script", so the tag check passes it through. The SVG is served with Content-Type: image/svg+xml and no Content Security Policy; when a browser opens the response directly, its XML parser resolves the prefix to the SVG namespace and executes the embedded script. This issue has been patched in version 3.6.2.
AnalysisAI
Cross-site scripting (XSS) in SiYuan personal knowledge management system versions 3.6.0-3.6.1 allows remote attackers to execute arbitrary JavaScript via the unauthenticated /api/icon/getDynamicIcon endpoint by bypassing SVG sanitization using XML namespace-prefixed element names. The vulnerability exploits a parser inconsistency where Go's HTML5 parser treats 'x:script' as a distinct tag while browsers' XML parsers resolve the namespace prefix to execute the script. Publicly available exploit code exists (GitHub issue #17246 documents the bypass technique), though no CISA KEV listing indicates mass exploitation campaigns at time of analysis.
Technical ContextAI
This vulnerability affects SiYuan's SVG icon processing pipeline, specifically the SanitizeSVG function introduced in version 3.6.0. The root cause (CWE-79: Improper Neutralization of Input During Web Page Generation) stems from a mismatch between parser behaviors. When Go's html5 library parses an SVG containing namespace-prefixed elements like '<x:script xmlns:x="http://www.w3.org/2000/svg">', it records the tag name literally as 'x:script' rather than resolving the namespace. The sanitization blocklist checks for exact tag matches (e.g., 'script'), allowing the prefixed variant to pass through. The endpoint serves the malicious SVG with 'Content-Type: image/svg+xml' and no Content Security Policy headers. When a victim's browser requests this resource directly, its XML parser correctly resolves the 'x:' prefix to the SVG namespace URI, normalizing 'x:script' to a standard 'script' element within the SVG context, thereby executing the embedded JavaScript payload. This represents a classic sanitization bypass exploiting semantic differences between validation-time and rendering-time parsers.
RemediationAI
Vendor-released patch: version 3.6.2 fully addresses this vulnerability by implementing namespace-aware SVG sanitization that properly resolves XML namespace prefixes before tag validation. All users of SiYuan 3.6.0 or 3.6.1 should immediately upgrade to version 3.6.2 or later, available at https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2. The patch modifies the SanitizeSVG function to normalize namespace-prefixed element names, preventing the parser mismatch exploitation vector. No workarounds are available that fully mitigate the risk without upgrading; network-level controls such as restricting access to the /api/icon/getDynamicIcon endpoint via firewall rules or reverse proxy filtering can reduce exposure for publicly accessible instances until patching is completed. After upgrading, administrators should review access logs for suspicious requests to the icon endpoint containing XML namespace declarations or unusual SVG content. Detailed remediation guidance is available in the security advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-73g7-86qr-jrg3.
A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. Rated critical severity (CVSS 9.8), t
A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. R
A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. Rated criti
A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. Rated c
SiYuan personal knowledge management system prior to 3.5.4 has a stored XSS vulnerability (CVSS 9.6) that allows code ex
Origin-validation bypass in SiYuan Note (open-source personal knowledge management) before 3.7.0 lets any installed Chro
Reflected XSS in SiYuan knowledge management before 3.5.9.
SiYuan knowledge management system prior to 3.5.5 has a path traversal in /api/file/copyFile allowing arbitrary file ope
SiYuan version 3.0.3 allows executing arbitrary commands on the server. Rated critical severity (CVSS 9.0), this vulnera
SQL injection in SiYuan prior to version 3.6.0 allows any authenticated user, including those with read-only access, to
Arbitrary file disclosure in SiYuan personal knowledge management system before 3.7.0 lets an unauthenticated remote att
Remote attackers can read arbitrary files from SiYuan servers (versions prior to 3.5.4) by exploiting server-side HTML r
Same weakness CWE-79 – Cross-site Scripting (XSS)
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Affected |
| openSUSE Leap 15.5 | Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
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