The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side.
Date: 2026-05
Affected: anthropic/claude_desktop
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-44467
CVE-2026-44470
CWE: CWE-269
CWE-297
CWE-322
CWE-59
CVSS: 6.8 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)

The Claude Desktop app gives you Claude Code with a graphical interface built for running multiple sessions side by side. From 1.2581.0 to before 1.4304.0, Claude Desktop's SSH remote development feature verified only whether a hostname existed in ~/.ssh/known_hosts without comparing the server's presented host key against the stored key. This allowed a network-positioned attacker to present an arbitrary SSH host key and have the connection silently accepted, enabling a man-in-the-middle attack on remote development sessions. Successful exploitation required the attacker to be in a network position to intercept SSH traffic (e.g., via ARP spoofing, rogue Wi-Fi, or DNS poisoning) and the target hostname to already have an entry in the victim's known_hosts file. This vulnerability is fixed in 1.4304.0.


Mitigations:

Architectural layers (MAESTRO):