{"id":"CVE-2026-20257","state":"PUBLISHED","title":"Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise","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 craft a classic dashboard that exfiltrates sensitive data from the browser of a higher-privileged user who views it.  \n\nThe exfiltration is possible because classic dashboard panels do not fully validate style attribute values, which can allow for requests to reach external domains outside the configured Trusted Domains List.  \n\nThe vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will.","publishedAt":"2026-06-10T17:16:03.885Z","updatedAt":"2026-06-10T18:24:02.482Z","severity":{"score":5.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","source":"cisco"},"assigner":"cisco","products":["Splunk Splunk Enterprise","Splunk Splunk Cloud Platform"],"affected":[{"vendor":"Splunk","product":"Splunk Enterprise","versions":[{"version":"10.2","status":"affected","lessThan":"10.2.4","versionType":"custom"},{"version":"10.0","status":"affected","lessThan":"10.0.7","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.12","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.13","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.3.2512","status":"affected","lessThan":"10.3.2512.13","versionType":"custom"},{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.15","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.23","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.132","versionType":"custom"}]}],"references":["https://advisory.splunk.com/advisories/SVD-2026-0607"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20257.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20257","state":"PUBLISHED","datePublished":"2026-06-10T17:16:03.885Z","dateUpdated":"2026-06-10T18:24:02.482Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.401Z"},"containers":{"cna":{"title":"Improper Input Validation through Classic Dashboard CSS in Splunk Enterprise","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 craft a classic dashboard that exfiltrates sensitive data from the browser of a higher-privileged user who views it.  \n\nThe exfiltration is possible because classic dashboard panels do not fully validate style attribute values, which can allow for requests to reach external domains outside the configured Trusted Domains List.  \n\nThe vulnerability requires the attacker to phish the victim by tricking them into initiating a request within their browser. The low-privileged user should not be able to exploit the vulnerability at will."}],"affected":[{"vendor":"Splunk","product":"Splunk Enterprise","versions":[{"version":"10.2","status":"affected","lessThan":"10.2.4","versionType":"custom"},{"version":"10.0","status":"affected","lessThan":"10.0.7","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.12","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.13","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.3.2512","status":"affected","lessThan":"10.3.2512.13","versionType":"custom"},{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.15","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.23","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.132","versionType":"custom"}]}],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0607"}],"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":[{"cweId":"CWE-20","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."}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-06-10T17:16:03.885Z"},"datePublic":"2026-06-10T00:00:00.000Z","source":{"advisory":"SVD-2026-0607"},"credits":[{"lang":"en","value":"Tony Tong (tongster)"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-10T18:23:55.427272Z","id":"CVE-2026-20257","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-10T18:24:02.482Z"}}]}}}