# CVE-2026-88808: Privilege escalation in Rancher

> Fleet agent uses cluster-admin credentials for downstream writes, allowing attackers to modify resources across namespaces in multi-tenant environments.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 29 Sep 2026
- **Also known as:** GHSA-q9v4-358v-r8q5

## What is CVE-2026-88808?

CVE-2026-88808 is a high-severity 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 vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy environments where different tenants share the same downstream clusters, for example different privileged or untrusted teams inside the same organization. This could lead to overwritten configuration files.

This issue affected SUSE Rancher Fleet 0.16 before 0.16.2, 0.15 before 0.15.7, and 0.14 before 0.14.11.

Weakness: CWE-250 (Execution with Unnecessary Privileges)

## Which versions are affected by CVE-2026-88808?

It affects 1 product.


Products: Suse Rancher Fleet.

## How do I fix CVE-2026-88808?

No fix has been published for CVE-2026-88808 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-88808 being exploited?

There is no known exploitation of CVE-2026-88808 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-2026-44938](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)
- [CVE-2026-93538](https://insights.sbomify.com/CVE-2026-93538/): Missing authorization in Rancher (high 7.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88808 and fix it if it is affected.

What it is: CVE-2026-88808 is a high-severity 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-2026-88808 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-2026-88808/ (Markdown: https://insights.sbomify.com/CVE-2026-88808/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88808
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88808
- OSV: https://osv.dev/vulnerability/CVE-2026-88808

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-88808/
Summaries are generated and may contain mistakes; the official description above is the record.