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CVE-2025-58437: Critical Vulnerability in Coder’s Session Handling

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Overview

A significant cybersecurity vulnerability, CVE-2025-58437, has been detected in the platform Coder, which is widely used by organizations to provision remote development environments via Terraform. The vulnerability exists in versions 2.22.0 through 2.24.3, 2.25.0 and 2.25.1 of the software. This flaw exposes systems to potential compromise and data leakage, thereby posing a serious threat to the security of users and organizations. Given the extent of Coder’s usage, this vulnerability is of substantial concern and demands immediate attention.

Vulnerability Summary

CVE ID: CVE-2025-58437
Severity: Critical, CVSS score 8.1
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

Coder | 2.22.0 – 2.24.3
Coder | 2.25.0 – 2.25.1

How the Exploit Works

The vulnerability arises from insecure session handling in Coder’s prebuilt workspaces. When a workspace is started, Coder generates a session token for the user, which is exposed via coder_workspace_owner.session_token. Prebuilt workspaces, owned by a built-in prebuilds system user, can be claimed by a different user. However, when a workspace is claimed, the previous session token for the prebuilds user is not expired, making it an exploitable vulnerability. Any Coder workspace templates that persist this automatically generated session token are potentially impacted.

Conceptual Example Code

Let’s illustrate this with a conceptual example. Suppose an attacker has somehow gained access to the prebuilds user’s session token. The attacker could then use this token in the following way:

GET /coder_workspace/ HTTP/1.1
Host: vulnerable-coder.com
Authorization: Bearer {prebuilds-user-session-token}
{ "workspace_id": "..." }

In this example, the attacker uses the prebuilds user’s session token to gain unauthorized access to the workspace data. This could potentially lead to data leakage or a system compromise.
Please remember, this is a conceptual example and not an actual exploit.

Mitigation

The vulnerability is fixed in versions 2.24.4 and 2.25.2 of Coder. Therefore, users are strongly recommended to update their software to these versions immediately. As a temporary mitigation measure, users can apply a vendor patch or use Web Application Firewall (WAF) and Intrusion Detection Systems (IDS). Still, the most secure solution is to update to the patched versions of the software.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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