CVE-2026-3438: Nexus Repository 3 - Reflected Cross-Site Scripting (XSS) in ?describe Pages

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-08 · updated 2026-09-18
Weakness: CWE-79

Description

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.

Affected products

Sonatype Nexus Repository 3: from 3.0.0 before 3.91.0 — fixed in 3.91.0

How to fix

Upgrade to a fixed version: Sonatype Nexus Repository 3 3.91.0. Check the vendor advisory for mitigations.

References

https://help.sonatype.com/en/sonatype-nexus-repository-3-91-0-release-notes.html
https://support.sonatype.com/hc/en-us/articles/50609137161363

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