# CVE-2026-93539: Unauthenticated GitRepo Spec Mutation via Fleet Git Webhook Receiver

> Unauthenticated attackers can modify GitRepo configuration in any namespace if the webhook secret is not configured, bypassing namespace authorization controls.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **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:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-8vfv-33cg-g75q

## What is CVE-2026-93539?

CVE-2026-93539 is a medium-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was discovered in Fleet's Git webhook receiver (the gitjob webhook service). When a webhook secret is not configured, incoming webhook requests are accepted without verification, and processing a request can change the spec.pollingInterval field of a matching GitRepo resource in any namespace. A caller with network access to the webhook service and no Kubernetes credentials can therefore alter GitRepo configuration outside

the namespaces they are authorized for.  This only affects SUSE Rancher Fleet 0.16 before 0.16.2, older versions are not affected.

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

## Which versions are affected by CVE-2026-93539?

It affects 1 product.


Products: Suse Rancher Fleet.

## How do I fix CVE-2026-93539?

No fix has been published for CVE-2026-93539 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93539 being exploited?

There is no known exploitation of CVE-2026-93539 in the wild and no public exploit code.

## Other vulnerabilities in SUSE Rancher

- [CVE-2026-44935](https://insights.sbomify.com/CVE-2026-44935/): Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer (critical 9.9)
- [CVE-2026-41050](https://insights.sbomify.com/CVE-2026-41050/): Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering (critical 9.9)
- [CVE-2026-88808](https://insights.sbomify.com/CVE-2026-88808/): Privilege escalation in Rancher (high 8.8)
- [CVE-2026-44938](https://insights.sbomify.com/CVE-2026-44938/): Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent (high 8.8)
- [CVE-2026-44937](https://insights.sbomify.com/CVE-2026-44937/): SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93539 and fix it if it is affected.

What it is: CVE-2026-93539 is a medium-severity missing authorization vulnerability in SUSE Rancher, published on 28 Sep 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-2026-93539 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-2026-93539/ (Markdown: https://insights.sbomify.com/CVE-2026-93539/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93539
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93539
- OSV: https://osv.dev/vulnerability/CVE-2026-93539

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93539/
Summaries are generated and may contain mistakes; the official description above is the record.