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SiYuan CVE-2026-59833

HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-07-09 GitHub_M
XSS Siyuan
8.6
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/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
vuln.today AI
8.8 HIGH

Network-delivered stored XSS needs no privileges (PR:N) but requires the victim to open a render path (UI:R); Electron OS command execution gives high C/I/A within the app (S:U, matching vendor SC:N).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 09, 2026 - 23:26 vuln.today

DescriptionCVE.org

SiYuan is an open-source personal knowledge management system. Prior to 3.7.1, SiYuan renders note and package content to HTML through the Lute engine with sanitization enabled, but Lute's dangerous javascript scheme block does not check form action or SVG xlink:href attributes, allowing stored cross-site scripting in document export-preview and Bazaar package README render paths that can execute OS commands in the Electron desktop renderer. This issue is fixed in versions 3.7.1.

AnalysisAI

Stored cross-site scripting in SiYuan before 3.7.1 escalates to OS command execution inside the Electron desktop renderer because the bundled Lute Markdown/HTML engine sanitizes content but fails to block dangerous javascript schemes in form action and SVG xlink:href attributes. An attacker who plants crafted content that a victim later opens via document export-preview or a Bazaar package README render can run arbitrary code on the victim's machine. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft note/README with javascript in form action or SVG xlink:href
Delivery
Deliver via shared document or Bazaar package
Exploit
Victim opens export-preview or renders README
Execution
Sanitizer bypass fires stored XSS
Persist
Script runs in Electron renderer
Impact
Execute arbitrary OS commands on host
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to actively open a poisoned render path - specifically SiYuan's document export-preview or a Bazaar package README render (CVSS UI:A). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H, base 8.6) reflects a network-reachable, low-complexity, unauthenticated payload with high confidentiality, integrity and availability impact, gated only by required user interaction (UI:A) - the victim must open an export-preview or render a Bazaar README. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a SiYuan note or a Bazaar marketplace package whose README embeds a form action or SVG xlink:href carrying a javascript: payload that survives Lute sanitization. When a victim installs the package or opens the malicious document in export-preview, the payload executes in SiYuan's Electron renderer and runs OS commands on the victim's machine. …
Remediation Upgrade to SiYuan v3.7.1 or later, which contains the Lute sanitization fix (Vendor-released patch: 3.7.1); the corrective change is commit ebe252e61fb93f258d083b9da0fa403679fdf94a and the advisory is GHSA-97xv-3v84-h358. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Audit inventory of all SiYuan deployments and document versions below 3.7.1; disable Bazaar package repository access and document preview rendering in application settings. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-59833 vulnerability details – vuln.today
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