CVE-2026-49294
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk4th percentile — higher than 4% of all known CVEs
Summary
Valhalla is an open source routing engine that is vulnerable to reflected XSS in versions 3.6.3 and prior due to improper neutralization of input in the JSONP callback parameter. An attacker can inject arbitrary JavaScript, potentially leading to session token theft or credential disclosure.
Risk Assessment
Organizations using vulnerable versions of Valhalla may be at risk of user data theft and unauthorized actions on behalf of victims, potentially leading to serious security breaches.
Recommendation
It is recommended to update Valhalla to the latest version that addresses this vulnerability and to implement additional security measures against XSS attacks.
Original NVD description (English source)
Valhalla is an open source routing engine and accompanying libraries for use with OpenStreetMap data. Versions 3.6.3 and prior are vulnerable to reflected cross-site scripting (XSS) due to 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. This issue was not fixed at time of publication.