CVE-2026-3438 Nexus Repository 3 - Reflected Cross-Site Scripting (XSS) in ?describe Pages
Unauthenticated attackers can execute arbitrary JavaScript in victims' browsers via crafted URLs in Nexus Repository, requiring user interaction.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-3438?
CVE-2026-3438 is a medium-severity cross-site scripting vulnerability in Sonatype Nexus Repository Manager, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-3438?
It affects 1 product.
Products include Sonatype Nexus Repository Manager.
How do I fix CVE-2026-3438?
No fix has been published for CVE-2026-3438 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-3438 being exploited?
There is no known exploitation of CVE-2026-3438 in the wild and no public exploit code.
Other vulnerabilities in Sonatype Nexus Repository Manager
- CVE-2019-7238 Sonatype Nexus Repository Manager Incorrect Access Control
- CVE-2019-9629 Hardcoded credentials in n/a
- CVE-2017-17717 Hardcoded credentials in n/a
- CVE-2026-3199 Nexus Repository 3 - Authenticated Remote Code Execution via Task Property Injection
- CVE-2026-5189 Nexus Repository 3 - Hardcoded Credential in Internal Database Component
Sources
Also known as GHSA-mx59-6f7x-f5f2.