What is CVE-2026-3438?

CVE-2026-3438 is a medium-severity vulnerability in Sonatype Nexus Repository, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-08.

How severe is CVE-2026-3438?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Sonatype Nexus Repository

CVE-2026-3438

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-04-08 · last modified 2026-09-18.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.7th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.004 · change: -0.002

Affected products

Sonatype Nexus Repository — versions 3.0.0
Sonatype Nexus Repository Manager

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

103e4ec9-0a87-450b-af77-479448ddef11 (Release Notes, patch)
103e4ec9-0a87-450b-af77-479448ddef11 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-3438?: CVE-2026-3438 is a medium-severity vulnerability in Sonatype Nexus Repository, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-08.
How severe is CVE-2026-3438?: Medium severity. CVSS v3 base score is 6.1 out of 10.