CVE-2026-88808CWE-250

CVE-2026-88808

High · published September 28, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
19.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00278 · 19.2th percentile
Weakness
CWE-250 · Execution with Unnecessary Privileges
Published
2026-09-28T20:17Z
Affected products (3)
ProductVersionsFixed in
suse/rancher_fleet≥ 0.14.0, < 0.14.110.14.11
suse/rancher_fleet≥ 0.15.0, < 0.15.70.15.7
suse/rancher_fleet≥ 0.16.0, < 0.16.20.16.2
References (1)
EPSS history
Timeline
  • 30 SEP 03:29Z
    EPSS moved — → 0%
    epss
  • 28 SEP 15:36Z
    Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
    cvelistv5