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CVE Vulnerability Details :
CVE-2026-66396
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-27 Jul, 2026 | 15:43
Updated At-28 Jul, 2026 | 01:06
Rejected At-
▼CVE Numbering Authority (CNA)
SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL

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.

Affected Products
Vendor
siyuan-note
Product
siyuan
Default Status
unaffected
Versions
Affected
  • From 0 before 3.7.2 (semver)
Unaffected
  • 3.7.2 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
4.09.3CRITICAL
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
3.18.4HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
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
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
hypnguyen1209
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
vendor-advisory
https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial
third-party-advisory
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
Resource:
vendor-advisory
Hyperlink: https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-img-ial
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
exploit
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
Resource:
exploit
Details not found