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CVE-2026-88808

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

HIGH
8.8
CVSS Score
Published: September 28, 2026 at 03:36 PM UTC
Updated: October 7, 2026 at 05:00 PM UTC
2 products affected across 2 vendorsRancherRancher Fleet

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Severity
HIGH8.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Rancher· Rancher
95%
0.14.0 ≤ v < 0.14.110.15.0 ≤ v < 0.15.70.16.0 ≤ v < 0.16.20.14.00.15.00.16.0
Affected range stops below 0.14.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.15.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.16.2, so it looks safe — our inference, not a vendor statement
Rancher Fleet· SUSE
95%
0.14.0 ≤ v < 0.14.110.15.0 ≤ v < 0.15.70.16.0 ≤ v < 0.16.2
Affected range stops below 0.14.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.15.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.16.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHsuse
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-250

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