SEPTEMBER 15, 2026
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Case File

CVE-2026-87811

HIGH · CVSS 7.3 EPSS 0.21% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-09 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

SiYuan versions prior to 3.8.2 are vulnerable due to improper encoding of HTML input value attributes, allowing attackers to inject malicious template paths. This can lead to JavaScript execution when a user accesses notebook configurations, potentially enabling unauthorized API requests and manipulation of application state. Organizations using affected versions of SiYuan should prioritize patching to mitigate this high-severity vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-87811
Severity
HIGH
CVSS
7.3
EPSS
0.21%
Java

Original NVD Description

SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper attribute encoding. Attackers can craft malicious template paths that break out of the attribute context and execute JavaScript when a victim opens notebook configuration, enabling same-origin API requests and application state manipulation.