{"id":"CVE-2026-20139","state":"PUBLISHED","title":"Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise","description":"In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the \"admin\" or \"power\" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive.","publishedAt":"2026-02-18T16:45:32.308Z","updatedAt":"2026-02-19T19:28:04.863Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","source":"cisco"},"assigner":"cisco","products":["Splunk Splunk Enterprise","Splunk Splunk Cloud Platform"],"affected":[{"vendor":"Splunk","product":"Splunk Enterprise","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.2","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.8","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.9","versionType":"custom"},{"version":"9.2","status":"affected","lessThan":"9.2.12","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.3","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.8","versionType":"custom"},{"version":"10.0.2503","status":"affected","lessThan":"10.0.2503.9","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.121","versionType":"custom"}]}],"references":["https://advisory.splunk.com/advisories/SVD-2026-0204"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20139.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20139","state":"PUBLISHED","datePublished":"2026-02-18T16:45:32.308Z","dateUpdated":"2026-02-19T19:28:04.863Z","assignerShortName":"cisco","assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateReserved":"2025-10-08T11:59:15.382Z"},"containers":{"cna":{"title":"Client-Side Denial of Service (DoS) through ''/splunkd/__raw/services/authentication/users/username'' REST API endpoint in Splunk Enterprise","descriptions":[{"lang":"en","value":"In Splunk Enterprise versions below 10.2.0, 10.0.2, 9.4.8, 9.3.9, and 9.2.12, and Splunk Cloud Platform versions below 10.2.2510.3, 10.1.2507.8, 10.0.2503.9, and 9.3.2411.121, a low-privileged user that does not hold the \"admin\" or \"power\" Splunk roles could craft a malicious payload into the `realname`, `tz`, or `email` parameters of the `/splunkd/__raw/services/authentication/users/username` REST API endpoint when they change a password. This could potentially lead to a client‑side denial‑of‑service (DoS). The malicious payload might significantly slow page load times or render Splunk Web temporarily unresponsive."}],"affected":[{"vendor":"Splunk","product":"Splunk Enterprise","versions":[{"version":"10.0","status":"affected","lessThan":"10.0.2","versionType":"custom"},{"version":"9.4","status":"affected","lessThan":"9.4.8","versionType":"custom"},{"version":"9.3","status":"affected","lessThan":"9.3.9","versionType":"custom"},{"version":"9.2","status":"affected","lessThan":"9.2.12","versionType":"custom"}]},{"vendor":"Splunk","product":"Splunk Cloud Platform","versions":[{"version":"10.2.2510","status":"affected","lessThan":"10.2.2510.3","versionType":"custom"},{"version":"10.1.2507","status":"affected","lessThan":"10.1.2507.8","versionType":"custom"},{"version":"10.0.2503","status":"affected","lessThan":"10.0.2503.9","versionType":"custom"},{"version":"9.3.2411","status":"affected","lessThan":"9.3.2411.121","versionType":"custom"}]}],"references":[{"url":"https://advisory.splunk.com/advisories/SVD-2026-0204"}],"metrics":[{"cvssV3_1":{"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1","baseScore":4.3,"baseSeverity":"MEDIUM"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","type":"cwe","description":"The software does not properly control the allocation and maintenance of a limited resource thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources."}]}],"providerMetadata":{"shortName":"cisco","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","dateUpdated":"2026-02-18T16:45:32.308Z"},"datePublic":"2026-02-18T00:00:00.000Z","source":{"advisory":"SVD-2026-0204"},"credits":[{"lang":"en","value":"STÖK / Fredrik Alexandersson"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-19T19:10:51.635917Z","id":"CVE-2026-20139","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","type":"CWE","lang":"en","description":"CWE-400 Uncontrolled Resource Consumption"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-19T19:28:04.863Z"}}]}}}