CVE-2026-119552
mediumUptime 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…
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.
CVSS
4.8
4.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-10-30 12:16
Modified: 2026-10-30 19:23
NVD status: Deferred
Last synced 1 day ago
Verified against the source API 2026-10-30 19:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://abraxaslabs.tech/research/uptime-kuma-setup-toctou disclosure@vulncheck.com
- https://github.com/louislam/uptime-kuma disclosure@vulncheck.com
- https://github.com/louislam/uptime-kuma/blob/2.5.8/server/server.js#L705-L722 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/uptime-kuma-through-2.5.8-race-condition-admin-creati... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-30 19:54 UTC · record ↗