Loading vulnerability…
CVE-2026-44211 is a cross-origin WebSocket hijacking vulnerability affecting Cline Kanban servers in Cline versions 2.13.0 and earlier. The issue is attributed to the kanban npm package used by the Cline CLI, which starts a local WebSocket server on localhost port 3484 without adequate connection protections. According to the provided content, the server does not validate the Origin header of incoming WebSocket upgrade requests and does not require authentication or a randomized per-session secret for access. Because browsers can initiate cross-origin WebSocket connections to localhost, an attacker-controlled website visited by a developer can silently connect to the local Kanban server while Cline is running. Once connected, the attacker can interact with exposed WebSocket endpoints to read sensitive workspace and runtime data, access terminal I/O channels for active AI agent sessions, inject prompts or commands that are processed as user input, and manipulate control endpoints. The provided material also references CWE-306 alongside CWE-1385, consistent with missing authentication and improper origin validation on WebSocket endpoints.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
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 cross-origin WebSocket hijack vulnerability affecting Cline Kanban servers in Cline versions 2.13.0 and prior.
A critical cross-origin WebSocket hijacking vulnerability in the Cline Kanban server/kanban npm package caused by missing origin validation and lack of authentication on a localhost WebSocket server, enabling data exfiltration, terminal hijacking, remote code execution, and denial of service.
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.