{"id":"CVE-2026-119552","title":"Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler","summary":"Uptime Kuma through 2.5.8 contains a race condition in the Socket.IO first-run setup handler that allows unauthenticated attackers to create an additional administrator account. Attackers can send concurrent setup requests during the bcr…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-367"],"vendor":"louislam","product":"uptime-kuma","affected":["uptime-kuma <= 2.5.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-30T15:21:04.753408Z"},"published":"2026-10-30","updated":"2026-10-30","sourceUpdated":"2026-10-30T15:54:36.118Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-119552","references":[{"url":"https://github.com/louislam/uptime-kuma/blob/2.5.8/server/server.js#L705-L722"},{"url":"https://abraxaslabs.tech/research/uptime-kuma-setup-toctou"},{"url":"https://github.com/louislam/uptime-kuma"},{"url":"https://www.vulncheck.com/advisories/uptime-kuma-through-2.5.8-race-condition-admin-creation-via-setup-handler","label":"VulnCheck Advisory: Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler"}],"tags":["cve.org"],"epss":0.00234,"epssPercentile":0.1435,"ingestedAt":"2026-11-05T16:07:30.521Z","slug":"CVE-2026-119552","body":"## Overview\n\nUptime Kuma through 2.5.8 contains a race condition in the Socket.IO first-run setup handler that allows unauthenticated attackers to create an additional administrator account. Attackers can send concurrent setup requests during the bcrypt hashing window to bypass the empty user table check, then modify monitors, API keys, and enable disableAuth.\n\n## Affected\n\n- `uptime-kuma <= 2.5.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}