SEPTEMBER 19, 2026
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Case File

CVE-2026-74902

HIGH · CVSS 8.6 EPSS 0.15% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-18 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability affects SiYuan versions prior to 3.7.4, allowing attackers to exploit a cross-site scripting flaw in the file upload validation process. By crafting malicious filenames, an attacker can execute script payloads with full OS command access when users interact with the editor. Organizations using affected versions should prioritize patching to mitigate the risk of potential exploitation.

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-2026-74902
Severity
HIGH
CVSS
8.6
EPSS
0.15%

Original NVD Description

SiYuan before v3.7.4 contains a cross-site scripting vulnerability in the file upload validation flow that fails to escape filenames before inserting them into HTML via insertAdjacentHTML. Attackers can craft a malicious filename containing script payloads that execute with full OS command access when a user drags, drops, or pastes the file into the editor.