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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-55431 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/coder/coder/pull/26146 GitHub, Inc. Issue Tracking  Patch 
https://github.com/coder/coder/releases/tag/v2.29.17 GitHub, Inc. Release Notes 
https://github.com/coder/coder/releases/tag/v2.32.7 GitHub, Inc. Release Notes 
https://github.com/coder/coder/releases/tag/v2.33.8 GitHub, Inc. Release Notes 
https://github.com/coder/coder/releases/tag/v2.34.2 GitHub, Inc. Release Notes 
https://github.com/coder/coder/security/advisories/GHSA-v54h-cp2w-9x4g GitHub, Inc. Patch  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-522 Insufficiently Protected Credentials GitHub, Inc.  
CWE-601 URL Redirection to Untrusted Site ('Open Redirect') GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-55431
NVD Published Date:
07/07/2026
NVD Last Modified:
07/08/2026
Source:
GitHub, Inc.