CVE-2026-84648: In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metada

Q: How do I fix CVE-2026-84648?

jenkins: upgrade to 2.568.3, 2.580. Exact commands for each OS are on this page.

Q: Is CVE-2026-84648 being exploited?

CVE-2026-84648 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-2026-84648 affect?

CVE-2026-84648 affects jenkins. Severity is high (CVSS 8.8). In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in contr

This month

HIGH 8.8UPGRADE

CVE-2026-84648 is a high-severity flaw (CVSS 8.8) affecting jenkins. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in control of agent processes.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-09-02
Last modified	2026-09-11

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-09-11 · 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
2026-09-11 21:14 UTCUpdated Record last modified

jenkins jenkins UPGRADE

Affected: < 2.568.3 · < 2.580

Fixed in: 2.568.3, 2.580

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.568.3 (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-2026-84648?

jenkins: upgrade to 2.568.3, 2.580. Exact commands for each OS are on this page.

Is CVE-2026-84648 being exploited?

CVE-2026-84648 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-2026-84648 affect?

CVE-2026-84648 affects jenkins. Severity is high (CVSS 8.8). In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metadata (source, level, and timestamp) resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers in contr

How urgent is CVE-2026-84648?

Priority 43/100. High severity

Software pages

Jenkins vulnerabilities

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References

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