CVE-2026-55431 Coder's session token leaked to arbitrary hosts via `coder open app` for external workspace apps

Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, coder open app opens external workspace-app URLs without validating the scheme or host. When an external app URL contains the $SESSIONTOKEN placeholder the...

CVE-2026-55431

Coder prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 is vulnerable to session-token leakage via coder open app for external workspace apps. The CLI opens external workspace-app URLs without validating scheme/host, and if a URL contains the placeholder $SESSION_TOKEN, the token is substitute...