Sonatype Nexus Security Advisory
Date: June 11th, 2026
Affected Versions: All Sonatype Nexus Repository versions from 3.0.0 up to and including 3.92.x
Fixed in Version: Sonatype Nexus Repository 3.93.0
Summary
A vulnerability has been identified in Sonatype Nexus Repository that may allow a remote unauthenticated attacker to conduct credential-guessing attacks against user accounts via authentication endpoints. Successful exploitation could allow an attacker to gain unauthorized access to the repository, potentially leading to disclosure of sensitive artifacts and configuration data.
At the time of this advisory, Sonatype is not aware of active exploitation of this vulnerability in the wild.
Recommendation
Customers are strongly advised to upgrade to Sonatype Nexus Repository version 3.93.0 or later. The latest version can be downloaded from https://help.sonatype.com/en/download.html
Immediate Mitigation Options
Customers who cannot immediately upgrade are advised to implement the following mitigations at the network or infrastructure level:
- Restrict network access to the Nexus Repository instance to trusted networks and IP ranges only. Limit exposure to the public internet where possible.
- Deploy a reverse proxy or WAF in front of Nexus Repository and configure authentication rate limiting at the proxy layer.
- Enable SSO (Single Sign-On) for UI-based authentication where supported. SSO providers typically enforce their own brute force protections for interactive login.
- Monitor authentication logs for unusual failed login patterns and configure alerting for repeated failures from the same source.
Credit
This issue was discovered and reported responsibly by Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
Frequently Asked Questions
Q: What is the risk associated with this vulnerability?
A: A remote unauthenticated attacker may be able to conduct credential-guessing attacks against user accounts in Sonatype Nexus Repository. If successful, an attacker could gain unauthorized access to the instance, potentially leading to the disclosure or tampering of artifact data, configuration settings, or credentials stored within the system.
Q: What preconditions must be met in order to be vulnerable?
A: The attacker must have network access to the Nexus Repository authentication endpoints. No authentication or special privileges are required to attempt exploitation. All Nexus Repository instances running a version prior to 3.93.0 that are reachable over a network should be considered at risk.
Q: Are there implications associated with this advisory itself?
A: Publishing this advisory may enable bad actors to attempt to exploit this vulnerability against unpatched instances. Customers should assess their exposure and take action to upgrade or apply mitigations as soon as possible.
Q: Why is Sonatype making this information available?
A: Sonatype follows a responsible disclosure process to ensure customers have timely, accurate information to protect their systems. We proactively notify customers and publish advisories to help them make informed decisions about their security posture.