CVE-2026-17593 Nexus Repository - Arbitrary Class Instantiation via Unsafe Realm Configuration

High 7.2 Published 7 Aug 2026 Updated 8 Aug 2026

An attacker with settings update permissions can inject arbitrary class names to execute code or cause authentication lockouts in Nexus Repository.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-17593?

CVE-2026-17593 is a high-severity code injection vulnerability in Sonatype Nexus Repository Manager, published on 7 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

An account holding the nexus:settings:update permission in Nexus Repository 3 (or the equivalent nexus:settings permission in the legacy Nexus Repository 2) could submit arbitrary values as realm identifiers through an internal configuration API that did not validate them against the set of registered realms. Because unrecognized entries were persisted and re-evaluated on every realm load via a legacy code path, this could result in unintended code executing inside the Nexus Repository process, and in some cases a persistent authentication lockout that was not visible through the administrative UI.

Weakness: CWE-470

Which versions are affected by CVE-2026-17593?

It affects 1 product.

Products include Sonatype Nexus Repository Manager.

How do I fix CVE-2026-17593?

Apply the vendor's patch.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-17593 being exploited?

There is no known exploitation of CVE-2026-17593 in the wild and no public exploit code.

All Sonatype Nexus Repository Manager vulnerabilities

Sources

Also known as GHSA-rw8g-2688-625j, MINI-9794-c5c6-6rvc, MINI-pr4g-jcx3-qf9w.