CVE-2026-82438: Apache Storm Webapp: Authenticated API Responses Exposed to Arbitrary Web Origins
Three CORS misconfigurations in Apache Storm 3.0.0 let malicious web pages from arbitrary origins read authenticated API responses.
CVE-2026-82438 (severity: important) affects Apache Storm Webapp (storm-webapp) versions 3.0.0 before 3.1.0. Three separate mechanisms allowed a web page on an unrelated origin to read responses served to authenticated users, including the Logviewer reflecting the request's Origin header in Access-Control-Allow-Origin while also sending Access-Control-Allow-Credentials. This enables a malicious site to silently exfiltrate authenticated Storm API and log data from a victim's browser session.