{"id":"CLEANSTART-2026-RB02560","summary":"WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authent...","details":"Security vulnerability affects the apache-nifi package. A WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authenticated user.","modified":"2026-10-31T16:04:21.652461006Z","published":"2026-10-31T11:53:33.830351Z","upstream":["CVE-2026-41839"],"database_specific":{},"references":[{"type":"ADVISORY","url":"https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-RB02560.json"},{"type":"WEB","url":"https://osv.dev/vulnerability/CVE-2026-41839"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41839"}],"affected":[{"package":{"name":"apache-nifi","ecosystem":"CleanStart","purl":"pkg:apk/cleanstart/apache-nifi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.0-r3"}]}],"database_specific":{"source":"https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-RB02560.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N"}]}