# CVE-2026-93538: Missing authorization in Rancher

> Attackers can spoof cluster labels during registration to access other tenants' GitRepo and Bundle configurations in SUSE Rancher Fleet.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-h9p5-fp5h-qpqr

## What is CVE-2026-93538?

CVE-2026-93538 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster.
This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2026-93538?

It affects 1 product.


Products: Suse Rancher Fleet.

## How do I fix CVE-2026-93538?

No fix has been published for CVE-2026-93538 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93538 being exploited?

There is no known exploitation of CVE-2026-93538 in the wild and no public exploit code.

## Other vulnerabilities in SUSE Rancher

- [CVE-2026-44935](https://insights.sbomify.com/CVE-2026-44935/): Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer (critical 9.9)
- [CVE-2026-41050](https://insights.sbomify.com/CVE-2026-41050/): Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering (critical 9.9)
- [CVE-2026-88808](https://insights.sbomify.com/CVE-2026-88808/): Privilege escalation in Rancher (high 8.8)
- [CVE-2026-44938](https://insights.sbomify.com/CVE-2026-44938/): Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent (high 8.8)
- [CVE-2026-44937](https://insights.sbomify.com/CVE-2026-44937/): SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93538 and fix it if it is affected.

What it is: CVE-2026-93538 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93538 in the wild and no public exploit code.

Affected product: SUSE Rancher. 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-2026-93538/ (Markdown: https://insights.sbomify.com/CVE-2026-93538/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93538
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93538
- OSV: https://osv.dev/vulnerability/CVE-2026-93538

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93538/
Summaries are generated and may contain mistakes; the official description above is the record.