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Vulnerability record · CVE-2026-56397 · published 21 June 2026

CVE-2026-56397: Cross-site scripting vulnerability

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

9.4 CVSS 4.0 Critical EPSS 0.70% · top 48.7% CWE-79 · Cross-site scripting Deferred
9.4CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Jun 2026Last modified by NVD

Description

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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:

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7
https://www.vulncheck.com/advisories/siyuan-remote-code-execution-via-malicious-bazaar-package-metadata-and-readme-2
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7

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Source: NIST National Vulnerability Database (record CVE-2026-56397), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.