# CVE-2026-117623: Jenkins stored cross-site scripting in breadcrumb menu tooltips

Source: https://junglewise.ai/threats/cve-2026-117623-jenkins-2-587-and-earlier-lts-2-580-1-and-earlier-does-not  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-117623 · Severity: info · Published 2026-10-28

Jenkins, a widely-used automation server for building and deploying software, fails to properly escape text in breadcrumb navigation menu tooltips. An attacker with basic read permissions can inject malicious code that executes in the browsers of other users viewing the same Jenkins interface, potentially compromising administrator accounts or stealing credentials.

Technologies: [Jenkins](https://junglewise.ai/threats/technologies/jenkins). Vendors: [Jenkins](https://junglewise.ai/threats/vendors/jenkins).

## Quick answers

**Is CVE-2026-117623 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-117623 being exploited in the wild.

**How severe is CVE-2026-117623?** Informational severity, published 28 October 2026.

**Which products and versions are affected?** Jenkins 2.587 and earlier, LTS 2.580.1 and earlier.

**Is there a fix for CVE-2026-117623?** 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-2026-117623 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-117623?** Check whether you run 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

A stored XSS vulnerability exists in Jenkins 2.587 and earlier, LTS 2.580.1 and earlier where breadcrumb bar overflow menu tooltip text is not HTML-escaped before rendering. Attackers with Overall/Read permission can inject arbitrary JavaScript that persists and executes when other users view the affected breadcrumb menu. The vulnerability is fixed in Jenkins 2.588 and LTS 2.580.2 by properly escaping tooltip text.

## Affected products

- Jenkins 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/](https://www.jenkins.io/security/advisory/2026-10-28/)

## Related threats

- [Jenkins path traversal in file browser workspace disclosure](https://junglewise.ai/threats/cve-2026-117626-jenkins-2-587-and-earlier-lts-2-580-1-and-earlier-improperly)
- [Jenkins missing HTTP proxy permission check](https://junglewise.ai/threats/cve-2026-117625-a-missing-permission-check-in-jenkins-2-587-and-earlier-lts-2)
- [Jenkins deserialization filter bypass in XStream resolves-to attribute](https://junglewise.ai/threats/cve-2026-117624-jenkins-2-587-and-earlier-lts-2-580-1-and-earlier-does-not)
- [Jenkins agent XSS via Stapler HttpResponse exceptions](https://junglewise.ai/threats/cve-2026-117622-jenkins-2-587-and-earlier-lts-2-580-1-and-earlier-allows-agents)
- [Jenkins workspace browser XSS in agent URL computation](https://junglewise.ai/threats/cve-2026-117621-jenkins-2-587-and-earlier-lts-2-580-1-and-earlier-computes-on)