CVE-2026-119552

Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler

Published Oct 30, 2026 CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler
First Time appeared Uptime-kuma Project
Uptime-kuma Project uptime-kuma
Weaknesses CWE-367
CPEs cpe:2.3:a:uptime-kuma_project:uptime-kuma:*:*:*:*:*:*:*:*
Vendors & Products Uptime-kuma Project
Uptime-kuma Project uptime-kuma
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 30, 2026, 3:54 PM
Reserved
Oct 30, 2026, 10:53 AM
Status
Deferred
Published
Oct 30, 2026, 12:16 PM
Modified
Oct 30, 2026, 7:23 PM