Fleet is widely used for Kubernetes cluster management; misuse of cluster-admin creds enables cross-tenant cluster compromise and data/config tampering.
CVE-2026-88808
Fleet agent used cluster-admin creds to write downstream resources, risking cluster compromise
Is CVE-2026-88808 being exploited?
Not confirmed. CVE-2026-88808 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.27% probability of exploitation in the next 30 days.
How severe is CVE-2026-88808?
CVE-2026-88808 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88808?
Yes. A fix has been recorded for CVE-2026-88808. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88808 affect?
CVE-2026-88808 affects SUSE Rancher Fleet < 0.16.2, SUSE Rancher Fleet < 0.15.7, SUSE Rancher Fleet < 0.14.11. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88808?
Upgrade to 0.16.2/0.15.7/0.14.11, rotate creds, audit RBAC and downstream resources
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Agent used cluster-admin credentials to write/overwrite resources on downstream clusters, enabling privilege escalation, config tampering, and full cluster compromise.
Immediate action required
- affected>= 0.16.0 and < 0.16.2
- affected>= 0.15.0 and < 0.15.7
- affected>= 0.14.0 and < 0.14.11
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.