Is CVE-2026-117618 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-117618 being exploited in the wild.

How severe is CVE-2026-117618?

Informational severity, published 28 October 2026.

Which products and versions are affected?

Jenkins Project Jenkins 2.587 and earlier, LTS 2.580.1 and earlier.

Is there a fix for CVE-2026-117618?

Yes: fixed in Jenkins 2.588, LTS 2.580.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-117618 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-117618?

Check whether you run Jenkins Project Jenkins at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-117618: Jenkins first user account creation race condition

CVE-2026-117618 · Severity: info · Published 2026-10-28

Jenkins is an open-source automation server widely used for continuous integration and deployment. An unauthenticated attacker can exploit a race condition during server setup to create an administrator account before the legitimate first user, potentially gaining full control of the Jenkins instance and its build pipelines.

Vendors: Jenkins Project.

Quick answers

Is CVE-2026-117618 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-117618 being exploited in the wild.
How severe is CVE-2026-117618?: Informational severity, published 28 October 2026.
Which products and versions are affected?: Jenkins Project Jenkins 2.587 and earlier, LTS 2.580.1 and earlier.
Is there a fix for CVE-2026-117618?: Yes: fixed in Jenkins 2.588, LTS 2.580.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-117618 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-117618?: Check whether you run Jenkins Project Jenkins at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Jenkins 2.588, LTS 2.580.2

Technical details

The HTTP endpoint for creating the first user account in Jenkins does not validate whether the setup wizard has been completed, creating a race condition. An unauthenticated attacker can POST to this endpoint simultaneously with the initial setup to instantiate an admin account. The vulnerability affects Jenkins 2.587 and earlier, and LTS 2.580.1 and earlier; the fix validates setup completion before allowing account creation.

Affected products

Jenkins Project Jenkins 2.587 and earlier, LTS 2.580.1 and earlier

Timeline

2026-10-28: disclosed

References

https://www.jenkins.io/security/advisory/2026-10-28/

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.