CVE-2026-17596 Sonatype CVE debrief

Who should care

Defenders and administrators of Nexus Repository 3 should assess exposure and apply the fixed version 3.95.0, focusing on users with specific permissions. This includes reviewing user permissions and restricting access to nexus:blobstores:create and nexus:blobstores:update. Additionally, defenders should prioritize verifying exposure and applying the fixed version 3.95.0, focusing on users with the nexus:blobstores:create or nexus:blobstores:update and 3.

Why it matters

Defenders should prioritize verifying exposure and applying the fixed version 3.95.0, focusing on users with the nexus:blobstores:create or nexus:blobstores:update permission, as a stored cross-site scripting (XSS) vulnerability was found in Nexus Repository 3.

• Potential execution of malicious script content in the browser of another user
• Elevation of privileges for users with specific permissions
• Possible compromise of system health-check status

Technical summary

A user with the nexus:blobstores:create or nexus:blobstores:update permission could set a blob store name containing malicious script content, which would later execute in the browser of another user viewing system health-check status. This issue has been fixed in version 3.95.0. The vulnerability was found in Nexus Repository 3, with a CVSS score of 6.3 and MEDIUM severity. Evidence of this vulnerability includes the ability for a user with specific permissions to execute malicious script content in the browser of another user.

Defensive priority

Defenders should prioritize verifying exposure and applying the fixed version 3.95.0, focusing on users with the nexus:blobstores:create or nexus:blobstores:update permission.

Recommended defensive actions

• Verify the version of Nexus Repository 3 and upgrade to 3.95.0 if necessary
• Review user permissions and restrict access to nexus:blobstores:create and nexus:blobstores:update
• Monitor system health-check status for potential malicious activity
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Evidence notes

The vulnerability was found in Nexus Repository 3, with a CVSS score of 6.3 and MEDIUM severity. The issue has been fixed in version 3.95.0. Evidence of this vulnerability includes the ability for a user with specific permissions to execute malicious script content in the browser of another user. Defenders should verify exposure and apply the fixed version 3.95.0, focusing on users with the nexus:blobstores:create or nexus:blobstores:update permission.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.