PatchSiren cyber security CVE debrief

CVE-2026-49294 valhalla CVE debrief

CVE-2026-49294 is a reflected cross-site scripting (XSS) vulnerability in Valhalla, an open-source routing engine and accompanying libraries for use with OpenStreetMap data. The vulnerability affects versions 3.6.3 and prior. The issue arises from improper neutralization of input in the JSONP callback parameter. When a request specifies a JSONP callback, the value is reflected directly into the HTTP response body with Content-Type: application/javascript, without any validation, output encoding, or allowlist filtering. An attacker can craft a URL containing arbitrary JavaScript in the callback parameter; if a victim is induced to load that URL via a <script src='...'> tag, the injected script executes in the context of the serving origin, potentially leading to session token theft, credential disclosure, or actions performed on behalf of the victim.