CVE-2026-3438: A reflected cross-site scripting vulnerability exists in Sonatype Nexus Repository versions 3.0.0 through 3.90

Routine

MEDIUM 6.1UPGRADE

CVE-2026-3438 is a medium-severity flaw (CVSS 6.1) affecting nexus repository manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A reflected cross-site scripting vulnerability exists in Sonatype Nexus Repository versions 3.0.0 through 3.90.2 that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser through a specially crafted URL. Exploitation requires user interaction.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-08
Last modified	2026-09-18

Publisher (CNA): Sonatype · Vendor: sonatype

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 23:16 UTCPublished CVE record published
2026-09-18 15:38 UTCUpdated Record last modified

sonatype nexus repository manager UPGRADE

Affected: >= 3.0.0 and < 3.91.0

Fixed in: 3.91.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy nexus-repository-manager || rpm -q nexus-repository-manager || nexus-repository-manager --version

2. UPGRADE to 3.91.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nexus-repository-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nexus-repository-manager

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 3.0.0 (Debian / Ubuntu)

apt-cache madison nexus-repository-manager sudo apt install nexus-repository-manager=<VERSION_BEFORE_3.0.0> sudo apt-mark hold nexus-repository-manager

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

dnf --showduplicates list nexus-repository-manager sudo dnf downgrade nexus-repository-manager-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add nexus-repository-manager

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-2026-3438?

nexus repository manager: upgrade to 3.91.0. Exact commands for each OS are on this page.

Is CVE-2026-3438 being exploited?

CVE-2026-3438 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-2026-3438 affect?

CVE-2026-3438 affects nexus repository manager. Severity is medium (CVSS 6.1). A reflected cross-site scripting vulnerability exists in Sonatype Nexus Repository versions 3.0.0 through 3.90.2 that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser through a specially crafted

How urgent is CVE-2026-3438?

Priority 29/100. No elevated risk signals yet.

Software pages

Sonatype Nexus vulnerabilities

Related CVEs

CVE-2026-5189 CRITICAL 9.8 UPGRADE CWE-798: Use of Hard-coded Credentials in Sonatype Nexus Repository Manager versions 3.0.0 through 3.70.5 allo
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CVE-2026-3048 LOW 3.8 UPGRADE An authenticated administrator who configures or tests LDAP connectivity in Sonatype Nexus Repository Manager
CVE-2026-3329 HIGH 7.5 UPGRADE A remote unauthenticated attacker may be able to conduct credential-guessing attacks against user accounts in
CVE-2026-10741 MEDIUM 4.9 UPGRADE Sonatype Nexus Repository Manager before 3.93.0 contains an authorization vulnerability in the proxy repositor

References

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