CVE-2026-100643: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
SiYuan versions before v3.8.4 fail to properly escape four stored Attribute View values in textarea elements, allowing authenticated attackers to inject JavaScript by modifying field descriptions, template sources, select option descriptions, or footer calculation templates. Attackers can execute stored JavaScript when other users open affected database menus, and in the Electron desktop app with nodeIntegration enabled, this leads to command execution with SiYuan process privileges.
AI Analysis
Technical Summary
SiYuan versions >=2.10.8 and <3.8.4 improperly neutralize input during web page generation by failing to escape four stored Attribute View values in textarea elements. Authenticated attackers can inject JavaScript by modifying field descriptions, template sources, select option descriptions, or footer calculation templates. The stored JavaScript executes when other users access the affected database menus. In the Electron desktop app context with nodeIntegration enabled, this XSS vulnerability escalates to command execution with the application's process privileges.
Potential Impact
Successful exploitation allows authenticated attackers to execute arbitrary JavaScript code in the context of other users viewing the affected database menus. In the Electron desktop app with nodeIntegration enabled, this can lead to command execution on the host system with the privileges of the SiYuan process, potentially compromising the user's environment.
Mitigation Recommendations
A fix is available in SiYuan version 3.8.4 and later. Users should upgrade to version 3.8.4 or newer to remediate this vulnerability. No additional mitigation steps are indicated in the provided data.
CVE-2026-100643: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
Description
SiYuan versions before v3.8.4 fail to properly escape four stored Attribute View values in textarea elements, allowing authenticated attackers to inject JavaScript by modifying field descriptions, template sources, select option descriptions, or footer calculation templates. Attackers can execute stored JavaScript when other users open affected database menus, and in the Electron desktop app with nodeIntegration enabled, this leads to command execution with SiYuan process privileges.
CVSS v4.0
Score 8.5high
Affected software
siyuan-note
siyuan
pkg:github/siyuan-note/siyuanRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
SiYuan versions >=2.10.8 and <3.8.4 improperly neutralize input during web page generation by failing to escape four stored Attribute View values in textarea elements. Authenticated attackers can inject JavaScript by modifying field descriptions, template sources, select option descriptions, or footer calculation templates. The stored JavaScript executes when other users access the affected database menus. In the Electron desktop app context with nodeIntegration enabled, this XSS vulnerability escalates to command execution with the application's process privileges.
Potential Impact
Successful exploitation allows authenticated attackers to execute arbitrary JavaScript code in the context of other users viewing the affected database menus. In the Electron desktop app with nodeIntegration enabled, this can lead to command execution on the host system with the privileges of the SiYuan process, potentially compromising the user's environment.
Mitigation Recommendations
A fix is available in SiYuan version 3.8.4 and later. Users should upgrade to version 3.8.4 or newer to remediate this vulnerability. No additional mitigation steps are indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-26T02:32:35.659Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab7c9a7f7a7c5410652fd2b
Added to database: 09/26/2026, 13:33:27 UTC
Last enriched: 09/26/2026, 14:03:45 UTC
Last updated: 09/27/2026, 01:57:11 UTC
Views: 10
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