CVE-2026-75916 (GCVE-0-2026-75916)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:01 – Updated: 2026-10-08 15:51
VLAI
Title
SiYuan XSS-to-RCE via unescaped block metadata in hint popup
Summary
SiYuan through 3.7.3 contains a cross-site scripting vulnerability in the '((' block-reference autocomplete hint popup. In genHintItemHTML() (app/src/protyle/hint/extend.ts), a candidate block's name, alias, and memo fields are concatenated into the popup's HTML without escaping. An attacker who can set these metadata fields on a block can inject a self-firing payload (e.g. <img src=x onerror=...>) that executes automatically when a victim types '((' followed by a search term that surfaces the crafted block. Because SiYuan's Electron windows run with nodeIntegration enabled, contextIsolation disabled, and no CSP, the injected script gains require('child_process') access, allowing the XSS to escalate to arbitrary OS command execution.
Severity
9.3 (Critical)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.6 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 19:21 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
siyuan-note siyuan     cpe:2.3:a:b3log:siyuan:-:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-05 00:00
Credits
alham-rizvi hey-raghav
Show details on NVD website
To clipboard 

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