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

Quick assessment

Affected
louislam uptime-kuma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Uptime Kuma 2.5.8 及更早版本存在一个竞态条件漏洞，该漏洞位于 Socket.IO 首次运行设置处理程序中，允许未认证的攻击者创建额外的管理员账户。攻击者可在 bcrypt 哈希计算窗口期间并发发送设置请求，从而绕过空用户表检查，进而修改监控项、API 密钥，并启用或禁用身份验证功能（disableAuth）。

CVSS 4.8 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
louislam uptime-kuma ≤ 2.5.8 affected
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I. Basic Information for CVE-2026-119552

Vulnerability Information
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Vulnerability Title
Uptime Kuma through 2.5.8 Race Condition Admin Creation via Setup Handler
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
louislam uptime-kuma 0 ~ 2.5.8 -

II. Public POCs for CVE-2026-119552

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III. Intelligence Information for CVE-2026-119552

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Vendor Advisories for CVE-2026-119552 (1)

Vendor Pages for CVE-2026-119552 (1)

Other References for CVE-2026-119552 (1)

IV. Related Vulnerabilities

Same product: uptime-kuma
Same vendor: louislam
Same weakness: CWE-367