Vulnerability record · CVE-2026-93923 · published 19 September 2026

CVE-2026-93923: Cross-site scripting vulnerability

SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.

8.6 CVSS 4.0 High EPSS 0.60% · top 53.5% CWE-79 · Cross-site scripting Deferred

8.6CVSS 4.0 base score

0.60%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

7References

21 Sep 2026Last modified by NVD

Description

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

Link	Tags
https://github.com/siyuan-note/siyuan
https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133
https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx

Track CVE-2026-93923 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed14 May 2026 6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed23 Jun 2025 6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed5 Jan 2026 6.1CVE-2025-68461Roundcube Webmail XSS via SVG animate tagRoundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is vulnerable to cross-site scripting through the animate tag in an SVG document. Because the f…KEVEPSS 27%analysed18 Dec 2025 10.0CVE-2026-22769Dell RecoverPoint for Virtual Machines hardcoded credential flawDell RecoverPoint for Virtual Machines versions prior to 6.0.3.1 HF1 contain a hardcoded credential vulnerability (CWE-798). An unauthenticated remot…KEVEPSS 13%analysed17 Feb 2026 7.1CVE-2025-14611Gladinet CentreStack and Triofox hardcoded AES key enables file inclusionCentreStack and Triofox before 16.12.10420.56791 use hardcoded values in their AES cryptoscheme, weakening protection for publicly exposed endpoints.…KEVEPSS 53%analysed12 Dec 2025 5.4CVE-2021-26829OpenPLC ScadaBR stored XSS via system_settings.shtmOpenPLC ScadaBR through 0.9.1 on Linux and through 1.12.4 on Windows allows stored cross-site scripting through system_settings.shtm. Because the inj…KEVEPSS 48%analysed11 Jun 2021 5.4CVE-2025-27915Zimbra Classic Web Client stored XSS via ICS file HTMLZimbra Collaboration Suite 9.0, 10.0 and 10.1 fail to sanitize HTML content in ICS files in the Classic Web Client. A malicious ICS entry embedded in…KEVEPSS 4.0%analysed12 Mar 2025

Source: NIST National Vulnerability Database (record CVE-2026-93923), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.