{"schemaVersion":3,"id":"CVE-2026-20256","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"In Splunk Enterprise versions below 10.2.4, 10.0.7, 9.4.12, and 9.3.13, and Splunk Cloud Platform versions below 10.3.2512.13, 10.2.2510.15, 10.1.2507.23, and 9.3.2411.132, a low-privileged user that does not hold the 'admin' or 'power' Splunk roles could cause data exfiltration through classic dashboards by redirecting a victim to an external site using a protocol-relative URL in a drill-down link.<br><br>The vulnerability exists because the URL classifier in classic dashboards only recognizes `http://` and `https://` schemes when checking for external URLs. Protocol-relative URLs such as `//attacker.com` bypass this check entirely, and Splunk Web does not show the external-navigation warning dialog to the victim.","dates":{"published":"2026-06-10T17:15:55.966Z","modified":"2026-06-10T18:19:26.044Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.7,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.7,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.7,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00361,"percentile":0.28468,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00361},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00361,"percentile":0.28468}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","sco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Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"}],"affected":[{"vendor":"splunk","product":"splunk","name":"splunk","label":"splunk","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 9.3.0, < 9.3.13","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.4.0, < 9.4.12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.0.0, < 10.0.7","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.2.0, < 10.2.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.3.0, < 9.3.13 | ≥ 9.4.0, < 9.4.12 | ≥ 10.0.0, < 10.0.7 | ≥ 10.2.0, < 10.2.4","eol":{"isEol":null,"eolDate":null,"matchMethod":"cpe","cycle":null,"product":{"name":"splunk","label":"Splunk","category":"server-app"}},"hubHref":"/vendor/splunk/splunk"},{"vendor":"splunk","product":"splunk_cloud_platform","name":"splunk cloud platform","label":"splunk_cloud_platform","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 9.3.2411, < 9.3.2411.132","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.1.2507, < 10.1.2507.23","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.2.2510, < 10.2.2510.15","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.3.2512, < 10.3.2512.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 9.3.2411, < 9.3.2411.132 | ≥ 10.1.2507, < 10.1.2507.23 | ≥ 10.2.2510, < 10.2.2510.15 | ≥ 10.3.2512, < 10.3.2512.13","eol":null,"hubHref":"/vendor/splunk/splunk_cloud_platform"},{"vendor":"splunk","product":"splunk enterprise","name":"Splunk Enterprise","label":"splunk enterprise","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.2, < 10.2.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.0, < 10.0.7","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.4, < 9.4.12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 9.3, < 9.3.13","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.2, < 10.2.4 | ≥ 10.0, < 10.0.7 | ≥ 9.4, < 9.4.12 | ≥ 9.3, < 9.3.13","eol":null,"hubHref":"/vendor/splunk/splunk_enterprise"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0606","label":"advisory.splunk.com/advisories/SVD-2026-0606","hostname":"advisory.splunk.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-06-10T17:15:55.966Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-10T18:19:26.044Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":23,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T15:34:05.353Z","stale":false,"partial":false}}