CVE-2026-82731

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Source
https://cve.org/CVERecord?id=CVE-2026-82731
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82731.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-82731
Aliases
Published
2026-09-01T02:09:38.801Z
Modified
2026-09-02T03:47:32.207295195Z
Severity
  • 2.3 (Low) CVSS_V4 - 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 CVSS Calculator
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.

The URL builders in lib/ashtypescript/typedcontroller/codegen/routerenderer.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: getpathparamtype/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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82731.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "6669e22ece34b4534e706a46d1842f01b68ee23a"
                },
                {
                    "fixed": "5165f752f5f92b755d946f2d1ce750ff69083ffc"
                }
            ]
        }
    ],
    "cna_assigner": "EEF",
    "cwe_ids": [
        "CWE-601"
    ]
}
References

Affected packages

Git / 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
Show details 
{
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.15.0"
        },
        {
            "fixed": "0.18.0"
        }
    ]
}

Affected versions

v0.*
v0.15.0
v0.15.1
v0.15.2
v0.15.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82731.json"