CVE-2026-117618

High

Description

In Jenkins 2.587 and earlier, LTS 2.580.1 and earlier, the HTTP endpoint for creating the first user account does not check whether the setup wizard has been completed, resulting in a race condition that allows unauthenticated attackers to create an administrator account while the initial user account is being replaced.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Jenkins

PublishedOct 28, 2026

First seenNov 4, 2026

Weakness typeCWE-362Race condition

How to fix

Update

jenkins jenkins2.580.2, 2.588 or later

Vendor advisories

jenkins.io/security/advisory/2026-10-28/#SECURITY-4122

Affected products

Product	Affected versions	Fixed in
jenkins jenkins	v < 2.580.2, v < 2.588	2.580.2, 2.588

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