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CVE-2026-59723 is a cross-origin WebSocket hijacking vulnerability in Cline versions before 3.0.30. The Cline Hub dashboard server, started through the dashboard command, fails to validate the Origin header during WebSocket connection establishment. For dashboards bound locally with ROOM_SECRET unset, the browser-request authorization logic permits an attacker-controlled website to submit desktopCommand messages. The messages can retrieve workspace state, modify MCP and provider configuration, and initiate command execution where a provider or model is configured.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity Cline Hub dashboard vulnerability caused by missing WebSocket Origin validation and insufficient authorization when ROOM_SECRET is unset on local loopback binds. It can enable a malicious website to interact with the local dashboard, access or alter workspace and provider configuration, and trigger command execution.
A cross-origin WebSocket hijacking vulnerability in the Cline Hub dashboard component of the npm cline package. In default localhost deployments without ROOM_SECRET, an attacker-controlled website can connect to the dashboard WebSocket, read or modify session and provider state, inject malicious stdio MCP server entries, and potentially achieve command execution under the victim user's account.
A cross-origin WebSocket hijacking vulnerability in the Cline Hub dashboard /browser endpoint caused by missing Origin validation and an authorization bypass when ROOM_SECRET is unset, potentially allowing attacker-controlled websites to read workspace state, change settings, and trigger command execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.