Description
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.

The 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.
Published: 2026-09-01
Score: 2.3 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
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Remediation

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History

Tue, 01 Sep 2026 02:45:00 +0000

Type Values Removed Values Added
Description 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. The 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.
Title Unescaped path parameters in AshTypescript generated TypeScript client allow request redirection
First Time appeared Ash-project
Ash-project ash Typescript
Weaknesses CWE-601
CPEs cpe:2.3:a:ash-project:ash_typescript:*:*:*:*:*:*:*:*
Vendors & Products Ash-project
Ash-project ash Typescript
References
Metrics cvssV4_0

{'score': 2.3, 'vector': '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'}

Subscriptions

Ash-project Ash Typescript
cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-09-01T02:09:38.801Z

Reserved: 2026-08-31T00:59:08.960Z

Link: CVE-2026-82731

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T03:16:52.993

Modified: 2026-09-01T03:16:52.993

Link: CVE-2026-82731

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T03:30:04Z

Weaknesses
  • CWE-601

    URL Redirection to Untrusted Site ('Open Redirect')