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CVE-2026-77125: Nexus Repository 3 - Incorrect Authorization on Blobstore Group Endpoints

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-22
• Weakness: CWE-863

Description

A vulnerability was identified in Sonatype Nexus Repository 3 in which two blobstore group management REST API endpoints did not correctly enforce the intended authorization check. A user granted only the nexus:blobstores:create permission could invoke these endpoints to convert an existing blobstore into a group blobstore, an action that should require the nexus:blobstores:update permission instead. This could result in unauthorized modification of blobstore configuration without administrator approval. The nexus:blobstores:create permission is a named permission that must be explicitly granted by an administrator; it is not held by default.

Affected products

• Sonatype Nexus Repository 3: from 3.19.0 before 3.96.0 — fixed in 3.96.0

How to fix

Upgrade to a fixed version: Sonatype Nexus Repository 3 3.96.0. Check the vendor advisory for mitigations.

References

• https://help.sonatype.com/en/sonatype-nexus-repository-3-96-0-release-notes.html
• https://support.sonatype.com/hc/en-us/articles/54643114434451/

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