{"id":"CVE-2026-82731","summary":"Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection","details":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in ash-project ash_typescript allows an attacker who controls a path-parameter value to redirect a generated client's request, and the credentials attached to it, to an unintended route or an external origin.\n\nThe URL builders in lib/ash_typescript/typed_controller/codegen/route_renderer.ex replace each :param placeholder with a bare template interpolation and never call encodeURIComponent, so the value reaches executeTypedControllerRequest raw. A value containing ../ is normalised away by the fetch URL resolver and reaches a different route, while ? or # truncates the path and can smuggle or override query parameters. For a route whose path begins with a parameter, a value such as /evil.example.com/x yields the protocol-relative URL //evil.example.com/x, sending the request and the credentials from TypedControllerConfig to an attacker-controlled host. Nothing constrains the value at runtime: get_path_param_type/2 emits only a TypeScript type, which is erased.\n\nThe query-string path is unaffected, since URLSearchParams.set encodes its own values.\n\nThis issue affects ash_typescript: from 0.15.0 before 0.18.0.","aliases":["EEF-CVE-2026-82731","GHSA-6g23-p936-fm2f"],"modified":"2026-09-03T03:30:44.626120939Z","published":"2026-09-01T02:09:38.801Z","database_specific":{"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"6669e22ece34b4534e706a46d1842f01b68ee23a"},{"fixed":"5165f752f5f92b755d946f2d1ce750ff69083ffc"}]}],"cna_assigner":"EEF","cwe_ids":["CWE-601"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82731.json"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82731.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-82731"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82731.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82731"},{"type":"FIX","url":"https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_typescript"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_typescript","events":[{"introduced":"fb4cc367b85b68d90b99be692dcbbbfc248c1adb"},{"fixed":"808e4b17ee821a8dac98bda5bf01da0fe1b69d41"},{"fixed":"5165f752f5f92b755d946f2d1ce750ff69083ffc"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0.15.0"},{"fixed":"0.18.0"}]}}],"versions":["v0.15.0","v0.15.3","v0.15.2","v0.15.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82731.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N"}]}