HIGH

CVE-2026-93923

2026-09-19 CVSS v3.1

CVSS

8.8

Description

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.

Weakness (CWE)

CWE-79 Cross-site Scripting (XSS)

EPSS Score

0.42%

Probability of exploitation in next 30 days

35.4th percentile

References

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

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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