medium4.8
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 admi…
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Uptime Kuma | through 2.5.8 |
Versions were read from the advisory text. No structured product data has been published for this record yet.
Weakness classification
References
- NVD record
- CVE.org record
- 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-creation-via-setup-handler