Logseq EUVD-2026-35435

Logseq desktop application (versions v0.10.15 and later) contains a critical remote code execution vulnerability allowing attackers to execute arbitrary OS commands at the Logseq process privilege level. The vulnerability is reachable through JavaScript execution pathways including application plugins and content-based XSS, affecting any organization whose users install or rely on Logseq for document management or knowledge work. With no vendor patch available and full code execution capability, this represents immediate risk to sensitive data and system integrity for affected users.

Within 24 hours: Identify all Logseq installations (v0.10.15 and later) across the organization through asset inventory and endpoint tools. Within 7 days: Implement interim controls-restrict plugin installations to official Logseq repositories, disable untrusted plugin sources, enforce Content Security Policy if applicable, and apply application-level sandboxing where available; document exceptions and elevated risk. Within 30 days: Establish vendor monitoring for patch availability; evaluate alternative note-taking applications (Obsidian, Notion, Joplin with plugin restrictions) as potential replacements; maintain air-gapped or offline Logseq usage for sensitive documents until patch release.

No vendor-released patch identified at time of analysis. Interim mitigations: (1) block execution of Logseq plugins except those from official sources; disable community plugin repositories entirely; (2) apply OS-level sandboxing (AppArmor, SELinux, or Windows Sandbox) to limit child process spawning and file system access; (3) monitor system audit logs for spawned child processes originating from Logseq process; (4) restrict Logseq instances from accessing sensitive network shares or environment variables; (5) maintain segregated or offline instances of Logseq for handling untrusted documents; (6) require administrator approval before plugin installation.