CVE-2026-117623 Jenkins Project CVE debrief

Who should care

Defenders responsible for Jenkins instances, particularly those with Overall/Read permission, should assess exposure and apply patches or mitigations. This includes verifying instance vulnerability and permissions, applying patches or mitigations for affected versions, and monitoring for suspicious activity. Additionally, defenders should review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant

Why it matters

CVE-2026-117623 is a stored cross-site scripting (XSS) vulnerability in Jenkins, exploitable by attackers with Overall/Read permission. Defenders should prioritize verifying exposure, applying patches, and monitoring for suspicious activity.

• Potential for XSS attacks against Jenkins users
• Exposure of Jenkins instances to stored cross-site scripting
• Need for verification of instance vulnerability and permissions
• Priority for applying patches or mitigations

Technical summary

The Jenkins breadcrumb bar overflow menu tooltips do not escape text, allowing for stored cross-site scripting (XSS) attacks. This vulnerability is exploitable by attackers with Overall/Read permission and affects Jenkins 2.587 and earlier, LTS 2.580.1 and earlier. The issue arises from the lack of text escaping in the tooltips, allowing for potential XSS attacks. Defenders should prioritize verifying exposure and applying patches or mitigations to prevent exploitation. The vulnerability has a CVSS score of 5.4 and is classified as MEDIUM severity.

Defensive priority

Defenders should prioritize verifying exposure and applying patches or mitigations, as this vulnerability allows for XSS attacks.

Recommended defensive actions

• Verify Jenkins instance exposure and permissions
• Apply patches or mitigations for affected versions
• Monitor for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability is a stored cross-site scripting (XSS) issue in the Jenkins breadcrumb bar overflow menu tooltips, exploitable by attackers with Overall/Read permission. Evidence from the CVE record and NVD entry suggests that defenders should verify exposure and apply patches or mitigations. The CVE record was published on 2026-10-28T17:18:21.640Z and has not been modified since then. The NVD entry andCVE

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.