CVE-2026-92986CWE-79cross-site-scripting

CVE-2026-92986

High · published September 17, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
56.7
In the wild
Unconfirmed
What it is

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.

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
0.00816 · 56.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-09-17T19:17Z
References (5)
https://github.com/siyuan-note/siyuan · [email protected]https://github.com/siyuan-note/siyuan/blob/v3.8.3/app/src/util/Tree.ts#L134 · [email protected]https://github.com/siyuan-note/siyuan/commit/6f093ebe50afc503e2a8b056164293054f8509e7 · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c5h9-g2c6-fxjw · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.4-cross-site-scripting-via-document-title · [email protected]
EPSS history
Timeline
  • 19 SEP 03:55Z
    EPSS moved — → 0%
    epss
  • 17 SEP 14:22Z
    SiYuan before 3.8.4 Cross-Site Scripting via Document Title
    cvelistv5