The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter.
" }, { "base64": false, "type": "text/markdown", "value": "The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter." } ], "value": "The application ships a TypeScript client generated by AshTypescript for a typed-controller route taking a path parameter, and passes untrusted input as that parameter." } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.18.0", "versionStartIncluding": "0.15.0", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "AND" } ], "credits": [ { "lang": "en", "type": "finder", "value": "Peter Ullrich" }, { "lang": "en", "type": "reporter", "value": "Peter Ullrich" }, { "lang": "en", "type": "remediation developer", "value": "Torkild Gundersen Kjevik / Ash Project" }, { "lang": "en", "type": "coordinator", "value": "Jonatan Männchen / EEF" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "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.
\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.
The query-string path is unaffected, since URLSearchParams.set encodes its own values.
This issue affects ash_typescript: from 0.15.0 before 0.18.0.
" }, { "base64": false, "type": "text/markdown", "value": "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." } ], "value": "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." } ], "impacts": [ { "capecId": "CAPEC-72", "descriptions": [ { "lang": "en", "value": "CAPEC-72 URL Encoding" } ] } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 2.3, "baseSeverity": "LOW", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-601", "description": "CWE-601 URL Redirection to Untrusted Site ('Open Redirect')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T02:09:38.801Z" }, "references": [ { "tags": [ "related", "vendor-advisory" ], "url": "https://github.com/ash-project/ash_typescript/security/advisories/GHSA-6g23-p936-fm2f" }, { "tags": [ "related" ], "url": "https://cna.erlef.org/cves/CVE-2026-82731.html" }, { "tags": [ "related" ], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82731" }, { "tags": [ "patch" ], "url": "https://github.com/ash-project/ash_typescript/commit/5165f752f5f92b755d946f2d1ce750ff69083ffc" } ], "source": { "discovery": "EXTERNAL" }, "title": "Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection" } } }