# CVE-2026-11403: Nexus Repository Manager - Insufficient Entropy in Format-Specific API Key Generation

> Insufficient entropy in API key generation allows attackers to guess keys and gain unauthorized access to repository operations as a targeted user.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-h5r5-2h4m-2rx5

## What is CVE-2026-11403?

CVE-2026-11403 is a high-severity vulnerability in Sonatype Nexus Repository Manager, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-331 (Insufficient Entropy)

## Which versions are affected by CVE-2026-11403?

It affects 1 product.


Products: Sonatype Nexus Repository Manager.

## How do I fix CVE-2026-11403?

No fix has been published for CVE-2026-11403 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11403 being exploited?

There is no known exploitation of CVE-2026-11403 in the wild and no public exploit code.

## Other vulnerabilities in Sonatype Nexus Repository Manager

- [CVE-2019-7238](https://insights.sbomify.com/CVE-2019-7238/): Sonatype Nexus Repository Manager Incorrect Access Control (critical 9.8, exploited in the wild)
- [CVE-2019-9629](https://insights.sbomify.com/CVE-2019-9629/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2017-17717](https://insights.sbomify.com/CVE-2017-17717/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2026-3199](https://insights.sbomify.com/CVE-2026-3199/): Nexus Repository 3 - Authenticated Remote Code Execution via Task Property Injection (critical 9.4)
- [CVE-2026-5189](https://insights.sbomify.com/CVE-2026-5189/): Nexus Repository 3 - Hardcoded Credential in Internal Database Component (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11403 and fix it if it is affected.

What it is: CVE-2026-11403 is a high-severity vulnerability in Sonatype Nexus Repository Manager, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-11403 in the wild and no public exploit code.

Affected product: Sonatype Nexus Repository Manager. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-11403/ (Markdown: https://insights.sbomify.com/CVE-2026-11403/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11403
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11403
- OSV: https://osv.dev/vulnerability/CVE-2026-11403

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11403/
Summaries are generated and may contain mistakes; the official description above is the record.