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CVE-2026-86538

knowns before 0.30.0 Path Traversal via templateFile parameter

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86538

Published

knowns versions before 0.30.0 contain a path traversal vulnerability in the POST /api/templates/preview endpoint that allows unauthenticated attackers to read arbitrary files. Attackers can supply directory traversal sequences in the templateFile parameter to bypass path restrictions and read sensitive files like credentials and configuration through the JSON response.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86538

Published

knowns

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "knowns-dev",
                    "product": "knowns",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/knowns",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.30.0"
                        },
                        {
                            "version": "0.30.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON