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CVE-2026-88808— Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters

Quick assessment

Affected
SUSE Rancher
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Rancher Manager 中发现了一个漏洞，其中 Fleet Agent 使用自身的 cluster-admin 凭证（而非部署中绑定的 ServiceAccount）将资源写入下游集群。该问题影响了多租户环境，在这些环境中，不同的租户共享相同的下游集群，例如同一组织内的不同特权团队或非信任团队。这可能导致配置文件被覆盖。 此问题影响了 SUSE Rancher Fleet 版本在 0.16 之前的 0.16.x（具体为 0.16.2 之前）、0.15.x（0.15.7 之前）以及 0.14.x（0.14

CVSS 8.8 · High
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I. Basic Information for CVE-2026-88808

Vulnerability Information
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Vulnerability Title
Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
带着不必要的权限执行
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
SUSE Rancher 0.16.0 ~ 0.16.2 -

II. Public POCs for CVE-2026-88808

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III. Intelligence Information for CVE-2026-88808

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Other References for CVE-2026-88808 (1)

Same Patch Batch · SUSE · 2026-09-28 · 8 CVEs total

CVE-2026-88804 9.6 CRITICAL Unauthenticated update of public UI settings leading to stored cross-site scripting in Ran
CVE-2026-78424 8.8 HIGH OS Command Injection in Packet-Capture (Sniffer) Filter leading to Remote Code Execution o
CVE-2026-88805 8.1 HIGH Session Not Revoked Server-Side on Logout in Rancher
CVE-2026-93538 7.1 HIGH Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agen
CVE-2026-93540 6.5 MEDIUM Fleet applies namespace labels and annotations without the bundle's service account privil
CVE-2026-93537 6.5 MEDIUM Path traversal in Fleet Helm valuesFiles allows disclosure of files outside the bundle dir
CVE-2026-93539 5.4 MEDIUM Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver

IV. Related Vulnerabilities

Same product: Rancher
Same vendor: SUSE
Same weakness: CWE-250

V. Comments for CVE-2026-88808

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