{"id":"CVE-2026-82438","title":"Description\n\nThree separate mechanisms allowed a web page on an unrelated origin to read responses that Storm's HTTP\ncomponents served to an authenticated user.\n\nThe Logviewer reflected the request's `Origin` header back in `Access-Contr…","summary":"Description\n\nThree separate mechanisms allowed a web page on an unrelated origin to read responses that Storm's HTTP\ncomponents served to an authenticated user.\n\nThe Logviewer reflected the request's `Origin` header back in `Access-Contr…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-346","CWE-942"],"vendor":"Apache Software Foundation","product":"org.apache.storm:storm-webapp","affected":["org.apache.storm:storm-webapp >= 3.0.0 < 3.1.0"],"published":"2026-09-14","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:58:48.430","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82438","references":[{"url":"https://lists.apache.org/thread/2o7tl3hcdd865njxsn4d9cxp1frkctz3","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/13/17","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-14T19:52:29.973602Z"},"ingestedAt":"2026-09-14T15:23:07.424Z","epss":0.00196,"epssPercentile":0.09605,"slug":"CVE-2026-82438","body":"## Overview\n\nDescription\n\nThree separate mechanisms allowed a web page on an unrelated origin to read responses that Storm's HTTP\ncomponents served to an authenticated user.\n\nThe Logviewer reflected the request's `Origin` header back in `Access-Control-Allow-Origin` while also\nsending `Access-Control-Allow-Credentials: true`. The published security model documents a permissive\n`Access-Control-Allow-Origin: *` posture as accepted, which is safe precisely because browsers refuse to\nhonour `*` together with credentials; reflecting the concrete origin removes that protection.\n\nThe shared CORS filter used by the UI, the Logviewer and DRPC was configured with a response header name\nwhere an initialisation parameter name was expected. The container ignored the setting and applied its own\ndefaults, which allow credentials.\n\nFinally, the UI and Logviewer wrapped API responses in a caller-supplied JSONP callback for every GET\nrequest. A script element on any origin can load such a response, which bypasses the same-origin policy\nentirely rather than negotiating it, and there was no way to turn the behaviour off.\n\nIn each case the effect is that a page visited by an authenticated operator can read cluster, topology and\nlog data on their behalf.\n\nMitigation\n\nUpgrade to 3.1.0, where the Logviewer no longer reflects the request origin in a credentialed response, the\nCORS filter is configured explicitly, and JSONP wrapping is governed by `ui.enable.jsonp`, which defaults to\nfalse.\n\nNote that disabling JSONP is a behaviour change for tooling that passes a `callback` query parameter; such\ntooling should be moved to ordinary JSON requests.\n\nUsers who cannot upgrade immediately should place the UI, Logviewer and DRPC HTTP endpoints behind a reverse\nproxy that strips `Access-Control-Allow-Origin` and `Access-Control-Allow-Credentials` from responses and\nrejects requests carrying a `callback` parameter.\n\nCredit\n\nThe ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":203308,"id":"CVE-2026-82438","ts":1789416907234,"field":"cvss","old":null,"new":"8.1"},{"seq":203307,"id":"CVE-2026-82438","ts":1789416907234,"field":"severity","old":"none","new":"high"}]}