ByteOS Network

NVD Vulnerability Details :

CVE-2026-66396

Deferred

Source-disclosure@vulncheck.com

Published At-27 Jul, 2026 | 16:18

Updated At-28 Jul, 2026 | 16:07

SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	9.3	CRITICAL	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Secondary	3.1	8.4	HIGH	CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
			N/A

Type: Secondary

Version: 4.0

Base score: 9.3

Base severity: CRITICAL

Vector:

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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

Type: Secondary

Version: 3.1

Base score: 8.4

Base severity: HIGH

Vector:

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Type: N/A

Version:

Base score:

Base severity: N/A

Vector:

Weaknesses

CWE ID	Type	Source
CWE-79	Secondary	disclosure@vulncheck.com

CWE ID: CWE-79

Type: Secondary

Source: disclosure@vulncheck.com

References

Hyperlink	Source	Resource
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34	disclosure@vulncheck.com	N/A
https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial	disclosure@vulncheck.com	N/A
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34	134c704f-9b21-4f2e-91b3-4a467353bcc0	N/A