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Nexus Repository Manager CVE-2026-11403

| EUVDEUVD-2026-43724 HIGH
Insufficient Entropy (CWE-331)
2026-07-14 Sonatype GHSA-h5r5-2h4m-2rx5
Docker Authentication Bypass Node.js Nexus Repository Manager
8.7
CVSS 4.0 · Vendor: Sonatype
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Severity by source

Vendor (Sonatype) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.5 MEDIUM

Network, unauthenticated (PR:N), but AC:H because a specific realm must be enabled and the victim must hold an active key; C:H with limited integrity (I:L) from acting as the user.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (Sonatype).

CVSS VectorVendor: Sonatype

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 16:06 vuln.today
CVE Published
Jul 14, 2026 - 15:28 cve.org
HIGH 8.7

DescriptionCVE.org

A vulnerability in Sonatype Nexus Repository Manager's format-specific API key generation may allow a remote attacker to gain unauthorized access to repository operations as a targeted user. A format-specific API key realm (NuGet API Key, Docker Bearer Token, or npm Bearer Token) must be enabled and the targeted user must have an active API key for this vulnerability to be exploitable.

Articles & Coverage 1

News 3 New Node.js Vulnerabilities - 3 High Severity Jul 14, 2026

AnalysisAI

Improper API key generation in Sonatype Nexus Repository Manager lets a remote attacker impersonate a targeted user and perform repository operations on their behalf. The flaw stems from insufficient entropy (CWE-331) in format-specific API key realms, so an attacker who can predict or reconstruct a victim's key gains their access without credentials. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach Nexus API over network
Delivery
Identify target user with active API key
Exploit
Predict format-specific token via weak entropy
Execution
Authenticate as victim with forged key
Impact
Perform repository operations as targeted user
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Vulnerability AssessmentAI

Exploitation Exploitation requires that a format-specific API key realm - specifically the NuGet API Key, Docker Bearer Token, or npm Bearer Token realm - is enabled on the Nexus instance, and that the targeted user already has an active API key issued under that realm; without both, the vulnerability is not exploitable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS 4.0 score is 8.7 (High) with vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N, indicating a network-reachable, low-complexity, unauthenticated attack with high confidentiality impact and no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach the Nexus API over the network identifies a target user (for example a service account used by CI) that holds an active NuGet/Docker/npm API key, then predicts or reconstructs that user's format-specific token by exploiting the weak key-generation entropy. Using the recovered token, the attacker authenticates as the victim and performs that user's repository operations - reading private artifacts and potentially publishing packages. …
Remediation Vendor-released patch: upgrade to Sonatype Nexus Repository 3.93.0 or later, per the 3.93.0 release notes (https://help.sonatype.com/en/sonatype-nexus-repository-3-93-0-release-notes.html) and the vendor advisory (https://support.sonatype.com/hc/en-us/articles/52347011450515/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Sonatype Nexus Repository Manager instances and document current versions to identify exposure scope. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-11403 vulnerability details – vuln.today
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