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

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 `$SESSION_TOKEN` placeholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to run `coder open app` against a workspace whose external app definition the attacker controls. Only a malicious template author can control external app URLs. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 applies a URL-scheme allowlist in the CLI and limits `$SESSION_TOKEN` substitution to trusted destinations like the web frontend. As a workaround, avoid running `coder open app` for untrusted workspaces.

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

不充分的凭证保护机制

Coder 信任管理问题漏洞

Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在安全漏洞，该漏洞源于未验证外部工作空间应用URL的方案或主机，可能导致攻击者利用会话令牌泄露进行攻击。以下版本受到影响：2.29.17之前版本、2.32.7之前版本、2.33.8之前版本和2.34.2之前版本。

N/A

N/A