CVE-2026-84656: A missing permission check in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier allows attackers with Item/Re

Q: How do I fix CVE-2026-84656?

jenkins: upgrade to newer than 2.579. Exact commands for each OS are on this page.

Q: Is CVE-2026-84656 being exploited?

CVE-2026-84656 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-2026-84656 affect?

CVE-2026-84656 affects jenkins. Severity is medium (CVSS 4.3). A missing permission check in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier allows attackers with Item/Read permission on at least one job to read build parameter names and values of jobs they have no access to.

Q: How urgent is CVE-2026-84656?

Priority 21/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2026-84656 is a medium-severity flaw (CVSS 4.3) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A missing permission check in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier allows attackers with Item/Read permission on at least one job to read build parameter names and values of jobs they have no access to.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-02
Last modified	2026-09-15

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-09-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-02 16:17 UTCPublished CVE record published
2026-09-15 18:06 UTCUpdated Record last modified

jenkins jenkins UPGRADE

Affected: <= 2.568.2 · <= 2.579

Fixed in: newer than 2.579

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.579 (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-2026-84656?

jenkins: upgrade to newer than 2.579. Exact commands for each OS are on this page.

Is CVE-2026-84656 being exploited?

CVE-2026-84656 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-2026-84656 affect?

CVE-2026-84656 affects jenkins. Severity is medium (CVSS 4.3). A missing permission check in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier allows attackers with Item/Read permission on at least one job to read build parameter names and values of jobs they have no access to.

How urgent is CVE-2026-84656?

Priority 21/100. No elevated risk signals yet.

Software pages

Jenkins vulnerabilities

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References

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