# CVE-2026-8100: Path traversal in Chef360

> An attacker can bypass access controls via URL-encoded paths to access restricted API endpoints, requiring specific deployment configurations.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/S:N/AU:Y/RE:M`)
- **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:** 18 Jun 2026
- **Updated:** 22 Jun 2026
- **Also known as:** GHSA-36qg-x8h8-59g2

## What is CVE-2026-8100?

CVE-2026-8100 is a high-severity path traversal vulnerability in Progress Chef Chef360, published on 18 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Impact

A security issue has been identified in Chef 360 that could allow unauthorized access to protected API endpoints under specific conditions. This issue is due to improper handling of URL-encoded paths during request processing. In certain scenarios, an authenticated request may bypass standard access controls gaining additional privileges, potentially allowing access to API endpoints that are intended to be restricted to higher-permissioned roles. The impact is limited to environments where the affected request patterns can be triggered and depends on specific deployment configuration and access controls in place.
Resolution
The issue has been addressed through product updates that improve request validation and enforce strict path normalization before authorization checks.  Customers are advised to update to the latest available version containing the fix, version 1.7.1 or later.

Weakness: CWE-23 (Relative Path Traversal)

## Which versions are affected by CVE-2026-8100?


## How do I fix CVE-2026-8100?

No fix has been published for CVE-2026-8100 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8100 being exploited?

There is no known exploitation of CVE-2026-8100 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8100 and fix it if it is affected.

What it is: CVE-2026-8100 is a high-severity path traversal vulnerability in Progress Chef Chef360, published on 18 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-2026-8100 in the wild and no public exploit code.

Affected product: Progress Chef Chef360. 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-2026-8100/ (Markdown: https://insights.sbomify.com/CVE-2026-8100/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8100
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8100
- OSV: https://osv.dev/vulnerability/CVE-2026-8100

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8100/
Summaries are generated and may contain mistakes; the official description above is the record.