{"id":"GHSA-x9qq-2qh5-8rxf","summary":"Coder's sub-agent app registration bypasses template port-sharing policy enforcement","details":"### Summary\n\nThe `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.\n\n\u003e **Note:** Exploitation requires the ability to register sub-agent apps in a workspace the attacker controls.\n\n### Impact\n\nA 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.\n\n### Patches\n\nThe fix clamps the sub-agent app sharing level to the template's `MaxPortSharingLevel`.\n\nThe fix was backported to all supported release lines:\n\n| Release line | Patched version |\n|---|---|\n| 2.34 | [v2.34.2](https://github.com/coder/coder/releases/tag/v2.34.2) |\n| 2.33 | [v2.33.8](https://github.com/coder/coder/releases/tag/v2.33.8) |\n| 2.32 | [v2.32.7](https://github.com/coder/coder/releases/tag/v2.32.7) |\n| 2.29 (ESR) | [v2.29.17](https://github.com/coder/coder/releases/tag/v2.29.17) |\n\n### Workarounds\n\nDisable wildcard app hostnames (`CODER_WILDCARD_ACCESS_URL`) to block subdomain-based app routing.\n\n### Resources\n\n- Fix: #26061\n\n### Credits\n\nCoder would like to thank Anthropic's Security Team (ANT-2026-22452) for independently disclosing this issue!","aliases":["CVE-2026-55432","GO-2026-5926"],"modified":"2026-07-07T20:41:44.111119740Z","published":"2026-07-06T21:08:32Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-862"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-07-06T21:08:32Z"},"references":[{"type":"WEB","url":"https://github.com/coder/coder/security/advisories/GHSA-x9qq-2qh5-8rxf"},{"type":"WEB","url":"https://github.com/coder/coder/pull/26061"},{"type":"PACKAGE","url":"https://github.com/coder/coder"}],"affected":[{"package":{"name":"github.com/coder/coder/v2","ecosystem":"Go","purl":"pkg:golang/github.com/coder/coder/v2"},"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"}},{"package":{"name":"github.com/coder/coder/v2","ecosystem":"Go","purl":"pkg:golang/github.com/coder/coder/v2"},"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"}},{"package":{"name":"github.com/coder/coder/v2","ecosystem":"Go","purl":"pkg:golang/github.com/coder/coder/v2"},"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"}},{"package":{"name":"github.com/coder/coder/v2","ecosystem":"Go","purl":"pkg:golang/github.com/coder/coder/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"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"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"}]}