# CVE-2025-14243: Mirror-registry: openshift mirror registry: user enumeration via authentication error messages

> Unauthenticated attackers can enumerate valid usernames and emails via distinct authentication error messages in the OpenShift Mirror Registry.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-v9gq-365f-qxxw

## What is CVE-2025-14243?

CVE-2025-14243 is a medium-severity vulnerability in mirror registry for Red Hat OpenShift, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw was found in the OpenShift Mirror Registry. This vulnerability allows an unauthenticated, remote attacker to enumerate valid usernames and email addresses via different error messages during authentication failures and account creation.

Weakness: CWE-209 (Generation of Error Message Containing Sensitive Information)

## Which versions are affected by CVE-2025-14243?

It affects 1 product.


Products: Redhat Mirror Registry for Red Hat Openshift.

## How do I fix CVE-2025-14243?

No fix has been published for CVE-2025-14243 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-14243 being exploited?

There is no known exploitation of CVE-2025-14243 in the wild and no public exploit code.

## Other vulnerabilities in mirror registry for Red Hat OpenShift

- [CVE-2026-32589](https://insights.sbomify.com/CVE-2026-32589/): Mirror-registry: quay: insecure direct object reference in blobupload (high 7.4)
- [CVE-2026-32590](https://insights.sbomify.com/CVE-2026-32590/): Mirror-registry: remote code execution using pickle deserialization (high 7.1)
- [CVE-2026-2377](https://insights.sbomify.com/CVE-2026-2377/): Mirror-registry: quay: quay: server-side request forgery via log export functionality (medium 6.5)
- [CVE-2026-32591](https://insights.sbomify.com/CVE-2026-32591/): Mirror-registry: quay: server-side request forgery in proxy cache upstream registry configuration (medium 5.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-14243 and fix it if it is affected.

What it is: CVE-2025-14243 is a medium-severity vulnerability in mirror registry for Red Hat OpenShift, published on 8 Apr 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-2025-14243 in the wild and no public exploit code.

Affected product: mirror registry for Red Hat OpenShift. 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-2025-14243/ (Markdown: https://insights.sbomify.com/CVE-2025-14243/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-14243
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-14243
- OSV: https://osv.dev/vulnerability/CVE-2025-14243

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-14243/
Summaries are generated and may contain mistakes; the official description above is the record.