CVE-2026-75033

Rancher: Cross-Cluster Secret Leakage via Namespace projectId Annotation Spoofing

State: Published
Severity: 7.7 High
Published: Sep 3, 2026
Updated: Sep 3, 2026
Reserved: Aug 17, 2026

Description

A flaw was found in Rancher Manager. Project Secrets were propagated into a namespace based only on its `field.cattle.io/projectId` annotation, without verifying that the referenced project belonged to the same downstream cluster. A user able to create namespaces on one cluster could set the annotation to a project ID from another cluster and have that project's secrets copied into a namespace under their control.

This issue affects Rancher: before 2.15.1.

Scores

CVSS	Score	Vector	Source
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	suse

Weaknesses

CWE-639 Authorization bypass through User-Controlled key

Affected Products

Product	Versions
RancherSUSE	before 2.15.1Affected

References

https://github.com/rancher/rancher/releases/tag/v2.15.1

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