CVE-2026-119552
Medium
Description
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.
SeverityMedium
CVSS4.8
Exploit probability—
ProductLouislam Uptime-kuma
PublishedOct 30, 2026
First seenNov 4, 2026
Weakness typeCWE-367CWE-367
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| louislam uptime-kuma | v ≤ 2.5.8 | — |
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