CVE WatchOct 30, 2026

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

CVSS

4.8

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 30, 2026 · Last modified: Oct 30, 2026 · CWE-367

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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