{"id":"CVE-2026-55432","aliases":["GHSA-x9qq-2qh5-8rxf"],"title":"Coder's sub-agent app registration bypasses template port-sharing policy enforcement","summary":"Coder's sub-agent app registration bypasses template port-sharing policy enforcement","severity":"medium","cvss":5.4,"cwe":["CWE-862"],"vendor":"coder","product":"github.com/coder/coder/v2","ecosystem":"go","affected":["github.com/coder/coder/v2 >= 2.34.0, < 2.34.2","github.com/coder/coder/v2 >= 2.33.0, < 2.33.8","github.com/coder/coder/v2 >= 2.30.0, < 2.32.7","github.com/coder/coder/v2 < 2.29.17"],"patched":["github.com/coder/coder/v2 2.34.2","github.com/coder/coder/v2 2.33.8","github.com/coder/coder/v2 2.32.7","github.com/coder/coder/v2 2.29.17"],"published":"2026-07-06","updated":"2026-07-06","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-x9qq-2qh5-8rxf","references":[{"url":"https://github.com/coder/coder/security/advisories/GHSA-x9qq-2qh5-8rxf"},{"url":"https://github.com/coder/coder/pull/26061"},{"url":"https://github.com/advisories/GHSA-x9qq-2qh5-8rxf"}],"tags":["ghsa","go"],"ingestedAt":"2026-07-06T21:45:52.957Z","epss":0.00315,"epssPercentile":0.24586,"slug":"CVE-2026-55432","body":"## Overview\n\n### 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> **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!\n\n## Affected packages\n\n- `github.com/coder/coder/v2 >= 2.34.0, < 2.34.2`\n- `github.com/coder/coder/v2 >= 2.33.0, < 2.33.8`\n- `github.com/coder/coder/v2 >= 2.30.0, < 2.32.7`\n- `github.com/coder/coder/v2 < 2.29.17`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/coder/coder/v2 2.34.2`\n- `github.com/coder/coder/v2 2.33.8`\n- `github.com/coder/coder/v2 2.32.7`\n- `github.com/coder/coder/v2 2.29.17`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}