Output Messenger Server Unauthenticated Zip-Slip Plugin RCE

Pre-auth chain on Output Messenger Server 2.0.x = 2.0.63: plaintext XMPP 14121 linkserver registration, SI offline synclog IQ, SOCKS5 zip upload 14135 with SharpZipLib 0.85.4 zip-slip. Plants OM.EvilMail.dll; RCE on next OutputMessengerServer restart as NT AUTHORITY\SYSTEM. !/usr/bin/env python3 ...

CVE-2026-66012

SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check model.CheckAuth with no admin-role or read-only enforcement. This exposes 31 MCP tools, including a file tool with list/read/write/delete/rename/copy...

CVE-2026-66012 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP

SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check model.CheckAuth with no admin-role or read-only enforcement. This exposes 31 MCP tools, including a file tool with list/read/write/delete/rename/copy...

EUVD-2026-49043

SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check model.CheckAuth with no admin-role or read-only enforcement. This exposes 31 MCP tools, including a file tool with list/read/write/delete/rename/copy...

CVE-2026-66012

SiYuan before v3.7.2 has an unauthenticated access path via POST /mcp due to missing authorization enforcement (no admin/read-only role checks). In Publish anonymous mode, an anonymous RoleReader JWT can reach /mcp, enabling an attacker to read conf/conf.json (exfiltrating accessAuthCode, api.tok...

CVE-2026-66012 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP

SiYuan before v3.7.2 contains a missing authorization vulnerability in the POST /mcp kernel endpoint, which is gated only by a general auth check model.CheckAuth with no admin-role or read-only enforcement. This exposes 31 MCP tools, including a file tool with list/read/write/delete/rename/copy...

PT-2026-64762

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.7.2 Description A missing authorization issue exists in the 'POST /mcp' kernel endpoint, which is only protected by a general authentication check model.CheckAuth without enforcing admin roles or read-only...