GHSA-x9qq-2qh5-8rxf

Source

https://github.com/advisories/GHSA-x9qq-2qh5-8rxf

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-x9qq-2qh5-8rxf/GHSA-x9qq-2qh5-8rxf.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-x9qq-2qh5-8rxf

Aliases

Published

2026-07-06T21:08:32Z

Modified

2026-07-07T20:41:44Z

Severity

5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N CVSS Calculator

Summary

Coder's sub-agent app registration bypasses template port-sharing policy enforcement

Details

Summary

The CreateSubAgent RPC did not validate a requested app sharing level against the template's MaxPortSharingLevel before persisting workspace apps, letting a workspace owner exceed the administrator's configured maximum.

Note: Exploitation requires the ability to register sub-agent apps in a workspace the attacker controls.

Impact

A workspace owner with an agent token could register a sub-agent app as PUBLIC even when the template's MaxPortSharingLevel was owner, exposing the app to unauthenticated users via the wildcard app domain. This affected only deployments using Enterprise port-sharing policy and wildcard app hostnames and required an authenticated workspace owner with an agent token.

Patches

The fix clamps the sub-agent app sharing level to the template's MaxPortSharingLevel.

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

Disable wildcard app hostnames (CODER_WILDCARD_ACCESS_URL) to block subdomain-based app routing.

Resources

Fix: #26061

Credits

Coder would like to thank Anthropic's Security Team (ANT-2026-22452) for independently disclosing this issue!

Database specific

{
    "cwe_ids": [
        "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-06T21:08:32Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
}

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-x9qq-2qh5-8rxf/GHSA-x9qq-2qh5-8rxf.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-x9qq-2qh5-8rxf/GHSA-x9qq-2qh5-8rxf.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-x9qq-2qh5-8rxf/GHSA-x9qq-2qh5-8rxf.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-x9qq-2qh5-8rxf/GHSA-x9qq-2qh5-8rxf.json"