{"id":"CVE-2026-90453","title":"A file-upload handler redirects the authenticated client's browser to a URL taken directly from that same request's Referer header, without validating it against the application's own origin","summary":"A file-upload handler redirects the authenticated client's browser to a URL taken directly from that same request's Referer header, without validating it against the application's own origin. This allows an authenticated attacker to craf…","severity":"low","cvss":3.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","cwe":["CWE-601"],"vendor":"CISA","product":"Malcolm","affected":["Malcolm < v26.06.0"],"published":"2026-09-11","updated":"2026-10-02","sourceUpdated":"2026-10-02T21:16:57.377","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90453","references":[{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json","label":"ics-cert@hq.dhs.gov"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-254-01","label":"ics-cert@hq.dhs.gov"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T12:54:30.614277Z"},"epss":0.00152,"epssPercentile":0.04308,"scores":{"nvd":3.5,"cna":5.1},"ingestedAt":"2026-09-14T15:23:07.429Z","slug":"CVE-2026-90453","body":"## Overview\n\nA file-upload handler redirects the authenticated client's browser to a URL taken directly from that same request's Referer header, without validating it against the application's own origin. This allows an authenticated attacker to craft a request that causes another user's browser to be redirected to an arbitrary external destination after completing an upload.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":19,"depthScoreParts":{"impact":19.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":215081,"id":"CVE-2026-90453","ts":1790980433185,"field":"cvss","old":"5.1","new":"3.5"},{"seq":215080,"id":"CVE-2026-90453","ts":1790980433185,"field":"severity","old":"medium","new":"low"}]}