SEPTEMBER 17, 2026
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Case File

CVE-2026-77086

CRITICAL · CVSS 9.1 EPSS 0.65% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-21 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability allows authenticated administrators in SiYuan versions prior to 3.7.4 to exploit the packageName parameter in the Bazaar install and uninstall endpoints, leading to potential path traversal attacks. This could enable attackers with admin access to write arbitrary files to any location or recursively delete directories, posing a significant risk to system integrity and data security. Organizations using affected versions should prioritize patching this vulnerability to mitigate the critical risk associated with unauthorized file manipulation.

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-2026-77086
Severity
CRITICAL
CVSS
9.1
EPSS
0.65%

Original NVD Description

SiYuan before v3.7.4 fails to validate the packageName parameter in Bazaar install and uninstall endpoints, allowing authenticated administrators to perform path traversal via directory traversal sequences. Attackers with admin access can write arbitrary files to any location via install operations or recursively delete directories via uninstall operations by supplying crafted packageName values.