MEDIUM 6.3 NVD
CVE-2026-119552
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 admin
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 bcrypt hashing window to bypass the empty user table check, then modify monitors, API keys, and enable disableAuth.
References
- https://abraxaslabs.tech/research/uptime-kuma-setup-toctou
- https://github.com/louislam/uptime-kuma
- https://github.com/louislam/uptime-kuma/blob/2.5.8/server/server.js#L705-L722
- https://www.vulncheck.com/advisories/uptime-kuma-through-2.5.8-race-condition-admin-creati
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-30 via NVD.
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