How severe is CVE-2026-88808?

CVE-2026-88808 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-88808 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-88808?

CVE-2026-88808 affects Suse Rancher Fleet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-88808?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-88808 published?

CVE-2026-88808 was published on 2026-09-28 and last updated on 2026-10-07.

CVE-2026-88808

CVE-2026-88808 is a high-severity vulnerability in Suse Rancher Fleet with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-250.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-250
Affected product: Suse Rancher Fleet
Published: 2026-09-28
Last modified: 2026-10-07

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.

Frequently asked questions

What is CVE-2026-88808?: 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.
How severe is CVE-2026-88808?: CVE-2026-88808 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-88808 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-88808?: CVE-2026-88808 affects Suse Rancher Fleet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-88808?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-88808 published?: CVE-2026-88808 was published on 2026-09-28 and last updated on 2026-10-07.

References

https://github.com/rancher/fleet/security/advisories/GHSA-q9v4-358v-r8q5

Affected products (1)

cpe:2.3:a:suse:rancher_fleet:*:*:*:*:*:*:*:*

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