{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20256", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.401Z", "datePublished": "2026-06-10T17:15:55.966Z", "dateUpdated": "2026-06-10T18:19:26.044Z"}, "containers": {"cna": {"affected": [{"product": "Splunk Enterprise", "vendor": "Splunk", "versions": [{"version": "10.2", "status": "affected", "versionType": "custom", "lessThan": "10.2.4"}, {"version": "10.0", "status": "affected", "versionType": "custom", "lessThan": "10.0.7"}, {"version": "9.4", "status": "affected", "versionType": "custom", "lessThan": "9.4.12"}, {"version": "9.3", "status": "affected", "versionType": "custom", "lessThan": "9.3.13"}]}, {"product": "Splunk Cloud Platform", "vendor": "Splunk", "versions": [{"version": "10.3.2512", "status": "affected", "versionType": "custom", "lessThan": "10.3.2512.13"}, {"version": "10.2.2510", "status": "affected", "versionType": "custom", "lessThan": "10.2.2510.15"}, {"version": "10.1.2507", "status": "affected", "versionType": "custom", "lessThan": "10.1.2507.23"}, {"version": "9.3.2411", "status": "affected", "versionType": "custom", "lessThan": "9.3.2411.132"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "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."}], "value": "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."}], "references": [{"url": "https://advisory.splunk.com/advisories/SVD-2026-0606"}], "title": "Improper Input Validation through Protocol-Relative URL in Classic Dashboards in Splunk Enterprise", "datePublic": "2026-06-10T00:00:00.000Z", "metrics": [{"cvssV3_1": {"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1", "baseScore": 5.7, "baseSeverity": "MEDIUM"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "description": "The product does not validate or incorrectly validates input that can affect the control flow or data flow of a program.", "cweId": "CWE-20"}]}], "source": {"advisory": "SVD-2026-0606"}, "credits": [{"lang": "en", "value": "Tony Tong (tongster)"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-06-10T17:15:55.966Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-10T18:18:59.939227Z", "id": "CVE-2026-20256", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-10T18:19:26.044Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-20256", "lastModified": "2026-06-10T18:36:19.463", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "psirt@cisco.com", "type": "Primary"}]}, "published": "2026-06-10T18:16:41.133", "references": [{"source": "psirt@cisco.com", "url": "https://advisory.splunk.com/advisories/SVD-2026-0606"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "psirt@cisco.com", "type": "Primary"}]}

{}

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