CVE-2026-88808 Privilege escalation in Rancher

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

Which versions are affected by CVE-2026-88808?

It affects 1 product.

Products include 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 Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer Critical 9.9
• CVE-2026-41050 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering Critical 9.9
• CVE-2026-44938 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent High 8.8
• CVE-2026-44937 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components High 8.3
• CVE-2026-93538 Missing authorization in Rancher High 7.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-q9v4-358v-r8q5.