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

> Unauthenticated attackers can create namespaces and inject RBAC rules via the Rancher webhook, leading to privilege escalation and unauthorized data modification.

- **Severity:** High 7.0 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jun 2026
- **Updated:** 30 Jun 2026
- **Also known as:** GHSA-h83p-cq95-vph4

## What is CVE-2026-44949?

CVE-2026-44949 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-44949?


## How do I fix CVE-2026-44949?

No fix has been published for CVE-2026-44949 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-44949 being exploited?

There is no known exploitation of CVE-2026-44949 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44949 and fix it if it is affected.

What it is: CVE-2026-44949 is a high-severity missing authorization vulnerability in SUSE Rancher, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-44949 in the wild and no public exploit code.

Affected product: SUSE Rancher. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-44949/ (Markdown: https://insights.sbomify.com/CVE-2026-44949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44949
- OSV: https://osv.dev/vulnerability/CVE-2026-44949

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44949/
Summaries are generated and may contain mistakes; the official description above is the record.