{"id":"CVE-2026-126308","summary":"Coder 2.38.0 before 2.38.2 Session Token Leak via Sub-Agent External Apps","details":"The web dashboard in Coder 2.24.0 before 2.29.23, 2.30.0 before 2.34.14, 2.35.0 before 2.36.9, 2.37.0 before 2.37.6, and 2.38.0 before 2.38.2 replaces the $SESSION_TOKEN placeholder in external app URLs with a full-access API key without checking whether the app belongs to a sub-agent. Code running in a workspace can register a disguised sub-agent app with a custom protocol URL, so the owner's click sends their API key to an attacker-chosen destination.","aliases":["GHSA-2x8w-q434-f76p"],"modified":"2026-11-15T02:30:42.445809304Z","published":"2026-11-13T09:36:20.400Z","database_specific":{"cwe_ids":["CWE-201"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126308.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126308.json"},{"type":"ADVISORY","url":"https://github.com/coder/coder/security/advisories/GHSA-2x8w-q434-f76p"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126308"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/coder-2.38.0-before-2.38.2-session-token-leak-via-sub-agent-external-apps"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/coder/coder","events":[{"introduced":"c3c6a672821e8ac2472c45f3be7a3c600aa8dae1"},{"fixed":"31290e6db4f16bf29025fe13a975b71bea691fca"},{"introduced":"8a148a9a57eef8dc19db13d1423adcdaadd319d4"},{"fixed":"c57613f858ba063507e4106ec3a7ce683df4d1d2"},{"introduced":"a300a06a0da0dced695ef8df8404c7c4dffd337e"},{"fixed":"36897aef4baae747ee6bca483acd39be3994fdab"},{"introduced":"43e67d12e278e13399cffc77f132e8e628339477"},{"fixed":"2d0907e2319818740fadbf742c093d997d40cce8"},{"introduced":"e5a74a775db34d6be3276d7d4f0ab5e7e1c07ec9"},{"fixed":"25a931e0225fd02eb02f08f787d4c72f85699088"},{"introduced":"a82f2350165c701ce3cbb6260f849e26f4264f79"},{"fixed":"a300a06a0da0dced695ef8df8404c7c4dffd337e"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"2.38.0"},{"fixed":"2.38.2"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"2.37.0"},{"fixed":"2.37.6"}]},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"2.36.0"},{"fixed":"2.36.9"}]},{"range":[{"introduced":"2.30.0"},{"fixed":"2.34.14"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"range":[{"introduced":"2.24.0"},{"fixed":"2.29.23"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"},{"strategy":"StandardRange","range":[{"introduced":"2.35.0"},{"fixed":"2.36.0"}],"source":"AFFECTED_FIELD"}]}}],"versions":["v2.37.5","v2.38.1","v2.37.4","v2.38.0","v2.37.3","v2.37.2","v2.37.1","v2.37.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126308.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N"}]}