Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters (CVE-2026-88808) | HOL Guard CVE

High · CVSS 8.8CVE-2026-88808

Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters

Answer in brief

CVE-2026-88808 records a High severity (CVSS 8.8) vulnerability in Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters. The current sources do not mark it as known exploited. The current feed maps SUSE/Rancher (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 28, 2026Updated Sep 28, 2026Source checked Sep 28, 2026First seen by HOL Sep 28, 2026Material review Sep 28, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SUSE/Rancher (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
SUSE/Ranchergeneric	>=0.16.0 <0.16.2 \|\| >=0.15.0 <0.15.7 \|\| >=0.14.0 <0.14.11	0.16.2, 0.15.7, 0.14.11

Recommended response

Check inventory. Check lockfiles and deployed manifests for SUSE/Rancher.
Review the reported fix. Update SUSE/Rancher to 0.16.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 28, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.