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CVE-2026-90583

kagisearch smallweb Query String Rendering sw.py index cross site scripting

CVSS 4.0 5.3 MEDIUMCVSS 3.1 4.3 MEDIUMCVSS 3.0 4.3 MEDIUMCVSS 2.0 5.0 Check source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-90583

Published

A security flaw has been discovered in kagisearch smallweb up to 0ecb9c48edbf98dc7e934b54fbac43869e64b4cf. The affected element is the function index of the file app/sw.py of the component Query String Rendering. Performing a manipulation of the argument qs results in cross site scripting. The attack is possible to be carried out remotely. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The patch is named 00b68144e583f20a6b67e29cf01bc07f57979ffb. It is recommended to apply a patch to fix this issue. Exploitability requires a raw HTTP request carrying unencoded double-quote characters in the query string - Werkzeug's request.query_string returns the raw request-target, and ordinary browsers percent-encode " as %22, so the payload only lands via netcat/curl-style raw sockets.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90583

Published

smallweb

Vendor product

Publisher's version information

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

{
                    "vendor": "kagisearch",
                    "product": "smallweb",
                    "versions": [
                        {
                            "version": "0ecb9c48edbf98dc7e934b54fbac43869e64b4cf",
                            "status": "affected"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:kagisearch:smallweb:*:*:*:*:*:*:*:*"
                    ],
                    "modules": [
                        "Query String Rendering"
                    ]
                }

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