louislam Uptime Kuma up to 2.5.8 Socket.IO first-run setup handler server.js race condition

Summaryinfo

A vulnerability, which was classified as problematic, has been found in louislam Uptime Kuma up to 2.5.8. This impacts an unknown function of the file server.js of the component Socket.IO first-run setup handler. This manipulation causes race condition. This vulnerability is handled as CVE-2026-119552. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in louislam Uptime Kuma up to 2.5.8. Affected by this vulnerability is an unknown functionality of the file server.js of the component Socket.IO first-run setup handler. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-119552 since 10/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-113817). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• louislam

Name

• Uptime Kuma

Version

• 2.5.0
• 2.5.1
• 2.5.2
• 2.5.3
• 2.5.4
• 2.5.5
• 2.5.6
• 2.5.7
• 2.5.8

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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