{"id":"CVE-2026-20202","state":"PUBLISHED","title":"Improper Input Validation during User Account Creation in Splunk Enterprise","description":"In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation.<br><br>This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users.","publishedAt":"2026-04-15T15:17:43.871Z","updatedAt":"2026-04-16T03:55:28.582Z","severity":{"score":6.6,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","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":"10.2.2","versionType":"custom"},{"version":"10.0","status":"affected","lessThan":"10.0.5","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.10","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.11","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.4.2603","status":"affected","lessThan":"Not Affected","versionType":"custom"},{"version":"10.3.2512","status":"affected","lessThan":"10.3.2512.6","versionType":"custom"},{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.10","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.20","versionType":"custom"},{"version":"10.0.2503","status":"affected","lessThan":"10.0.2503.13","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.127","versionType":"custom"}]}],"references":["https://advisory.splunk.com/advisories/SVD-2026-0401"],"weaknesses":["CWE-176"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20202.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20202","state":"PUBLISHED","datePublished":"2026-04-15T15:17:43.871Z","dateUpdated":"2026-04-16T03:55:28.582Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.397Z"},"containers":{"cna":{"title":"Improper Input Validation during User Account Creation in Splunk Enterprise","descriptions":[{"lang":"en","value":"In Splunk Enterprise versions below 10.2.2, 10.0.5, 9.4.10, and 9.3.11, and Splunk Cloud Platform versions below 10.4.2603.0, 10.3.2512.6, 10.2.2510.10, 10.1.2507.20, 10.0.2503.13, and 9.3.2411.127, a user who holds a role that contains the high-privilege capability `edit_user`could create a specially crafted username that includes a null byte or a non-UTF-8 percent-encoded byte due to improper input validation.<br><br>This could lead to inconsistent conversion of usernames into a proper format for storage and account management inconsistencies, such as being unable to edit or delete affected users."}],"affected":[{"vendor":"Splunk","product":"Splunk Enterprise","versions":[{"version":"10.2","status":"affected","lessThan":"10.2.2","versionType":"custom"},{"version":"10.0","status":"affected","lessThan":"10.0.5","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.10","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.11","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.4.2603","status":"affected","lessThan":"Not Affected","versionType":"custom"},{"version":"10.3.2512","status":"affected","lessThan":"10.3.2512.6","versionType":"custom"},{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.10","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.20","versionType":"custom"},{"version":"10.0.2503","status":"affected","lessThan":"10.0.2503.13","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.127","versionType":"custom"}]}],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0401"}],"metrics":[{"cvssV3_1":{"vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1","baseScore":6.6,"baseSeverity":"MEDIUM"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-176","lang":"en","type":"cwe","description":"The software does not properly handle when an input contains Unicode encoding."}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-04-15T15:17:43.871Z"},"datePublic":"2026-04-15T00:00:00.000Z","source":{"advisory":"SVD-2026-0401"},"credits":[{"lang":"en","value":"Ryan Luke<br><br>Mahfujur Rahman (mahfujwhh)"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-20202"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-16T03:55:28.582Z"}}]}}}