CVE-2026-93923CWE-79cross-site-scripting

CVE-2026-93923

High · published September 19, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
48.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
8.6 · 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
EPSS
0.00599 · 48.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-19T04:16Z
References (7)
https://github.com/siyuan-note/siyuan · [email protected]https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133 · [email protected]https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194 · [email protected]https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76 · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx · [email protected]https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 22 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 18 SEP 23:12Z
    SiYuan through 3.8.4 Stored XSS via Heading Style Attribute
    cvelistv5