CVE-2026-92986: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.
AI Analysis
Technical Summary
SiYuan versions prior to 3.8.4 improperly neutralize input during web page generation by rendering document titles as HTML without escaping markup characters in the backlink dock tree. Attackers can exploit this by setting malicious titles through the rename API or by crafting notebooks, resulting in cross-site scripting that executes scripts in the Electron renderer process. Since the Electron renderer has access to the child_process module, this can lead to command execution on the affected system.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts within the Electron renderer context, which has elevated privileges including access to the child_process module. This can lead to remote code execution on the host system, posing a significant security risk.
Mitigation Recommendations
A fix is available in SiYuan version 3.8.4. Users should upgrade to version 3.8.4 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
CVE-2026-92986: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in siyuan-note siyuan
Description
SiYuan before 3.8.4 renders document titles as HTML in the backlink dock tree without escaping markup characters. Attackers can set malicious titles through the rename API or crafted notebooks to execute scripts in the Electron renderer with access to child_process for command execution.
CVSS v4.0
Score 8.6high
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 prior to 3.8.4 improperly neutralize input during web page generation by rendering document titles as HTML without escaping markup characters in the backlink dock tree. Attackers can exploit this by setting malicious titles through the rename API or by crafting notebooks, resulting in cross-site scripting that executes scripts in the Electron renderer process. Since the Electron renderer has access to the child_process module, this can lead to command execution on the affected system.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts within the Electron renderer context, which has elevated privileges including access to the child_process module. This can lead to remote code execution on the host system, posing a significant security risk.
Mitigation Recommendations
A fix is available in SiYuan version 3.8.4. Users should upgrade to version 3.8.4 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-17T13:55:54.288Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aabfa1355bf5e2cf57f75e4
Added to database: 09/17/2026, 14:32:51 UTC
Last enriched: 09/17/2026, 14:46:52 UTC
Last updated: 09/17/2026, 22:44:27 UTC
Views: 6
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