CVE-2026-84653: Jenkins 2.421 through 2.579 (both inclusive), LTS 2.426.1 through 2.568.2 (both inclusive) does not correctly

Routine

LOW 3.5UPGRADE

CVE-2026-84653 is a low-severity flaw (CVSS 3.5) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jenkins 2.421 through 2.579 (both inclusive), LTS 2.426.1 through 2.568.2 (both inclusive) does not correctly perform permission checks in the Appearance configuration page, allowing attackers with Overall/Manage permission to modify Appearance configuration options they should not have access to.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 73%)
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 18:15 UTCUpdated Record last modified

jenkins jenkins UPGRADE

Affected: >= 2.421 and <= 2.579 · >= 2.426.1 and <= 2.568.2

Fixed in: newer than 2.579

Safe to downgrade to: a release before 2.421

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.

3. If no update is available yet, DOWNGRADE to a release before 2.421 (Debian / Ubuntu)

apt-cache madison jenkins sudo apt install jenkins=<VERSION_BEFORE_2.421> sudo apt-mark hold jenkins

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jenkins sudo dnf downgrade jenkins-<VERSION_BEFORE_2.421> sudo dnf versionlock add jenkins

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-84653?

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

Is CVE-2026-84653 being exploited?

CVE-2026-84653 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-2026-84653 affect?

CVE-2026-84653 affects jenkins. Severity is low (CVSS 3.5). Jenkins 2.421 through 2.579 (both inclusive), LTS 2.426.1 through 2.568.2 (both inclusive) does not correctly perform permission checks in the Appearance configuration page, allowing attackers with Overall/Manage permission to modify Appear

How urgent is CVE-2026-84653?

Priority 19/100. No elevated risk signals yet.

Software pages

Jenkins vulnerabilities

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References

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