EUVD-2026-68930Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AC:H folds in the AT:P condition (leading-param route required); UI:R for victim-triggered fetch; C:L for credential exfiltration with no integrity or availability impact.
Primary rating from Vendor (EEF).
CVSS VectorVendor: EEF
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Open redirect in ash_typescript's TypeScript client code generator allows an attacker who controls a path-parameter value to cause a generated client to forward its request - including any credentials configured in TypedControllerConfig - to an attacker-controlled host. Affected are applications using ash_typescript 0.15.0 through 0.17.x that expose generated TypeScript clients where path parameters are user-influenced. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) the application must use ash_typescript 0.15.0-0.17.x and have regenerated TypeScript clients from it; (2) at least one route whose path begins with a parameter placeholder must be reachable - this is the configuration that enables the protocol-relative URL (//attacker.com) to form; (3) an attacker must be able to control or influence the value supplied as that leading path parameter in a real client invocation, either via a crafted link, injected data, or a manipulated UI flow, and the victim must trigger the client call. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 2.3 (AV:N/AC:L/AT:P/PR:N/UI:P) correctly reflects two significant dampeners: AT:P acknowledges that credential exfiltration via the protocol-relative redirect requires a route whose first path segment is a parameter placeholder, which is a specific but not uncommon routing pattern; UI:P requires that a real user or automated integration invoke the generated client with an attacker-influenced parameter value. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade ash_typescript to version 0.18.0 or later, which wraps every path-parameter interpolation in encodeURIComponent() at code-generation time (patch commit 5165f752f5f92b755d946f2d1ce750ff69083ffc). … Detailed patch versions, workarounds, and compensating controls in full report. |
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