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