CVE-2026-117623: Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not escape the text shown in the tooltips of breadcrum

Q: How do I fix CVE-2026-117623?

jenkins: upgrade to 2.580.2, 2.588. Exact commands for each OS are on this page.

Q: Is CVE-2026-117623 being exploited?

CVE-2026-117623 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-117623 affect?

CVE-2026-117623 affects jenkins. Severity is medium (CVSS 5.4). Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not escape the text shown in the tooltips of breadcrumb bar overflow menu entries, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Overall/

Q: How urgent is CVE-2026-117623?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-117623 is a medium-severity flaw (CVSS 5.4) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not escape the text shown in the tooltips of breadcrumb bar overflow menu entries, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Overall/Read permission.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-10-28
Last modified	2026-11-02

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-28 17:18 UTCPublished CVE record published
2026-11-02 14:47 UTCUpdated Record last modified

jenkins jenkins UPGRADE

Affected: < 2.580.2 · < 2.588

Fixed in: 2.580.2, 2.588

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy jenkins || rpm -q jenkins || jenkins --version

2. UPGRADE to 2.580.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jenkins

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jenkins

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-117623?

jenkins: upgrade to 2.580.2, 2.588. Exact commands for each OS are on this page.

Is CVE-2026-117623 being exploited?

CVE-2026-117623 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-117623 affect?

CVE-2026-117623 affects jenkins. Severity is medium (CVSS 5.4). Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not escape the text shown in the tooltips of breadcrumb bar overflow menu entries, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Overall/

How urgent is CVE-2026-117623?

Priority 21/100. No elevated risk signals yet.

Software pages

Jenkins vulnerabilities

Related CVEs

CVE-2026-117612 HIGH 8.8 UPGRADE Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not apply its deserialization filter to classes refere
CVE-2026-117613 MEDIUM 5.4 UPGRADE Jenkins 2.587 and earlier, LTS 2.580.1 and earlier does not restrict item types in collections after deseriali
CVE-2026-117614 HIGH 7.2 UPGRADE Jenkins 2.587 and earlier, LTS 2.580.1 and earlier converts the launch commands in older agent configurations
CVE-2026-117615 MEDIUM 6.5 UPGRADE Jenkins 2.587 and earlier, LTS 2.580.1 and earlier follows symbolic links when copying the directory of an ite
CVE-2026-117616 HIGH 8.8 UPGRADE Jenkins 2.587 and earlier, LTS 2.580.1 and earlier provides an HTTP endpoint that loads agents by name without

References

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