# CVE-2026-57855: Cockpit CMS Missing Authorization in Bucket File Storage API

> Any authenticated user can perform unauthorized file operations on all buckets due to missing ACL checks in the API.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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:** 13 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-fjpv-pfvg-c462

## What is CVE-2026-57855?

CVE-2026-57855 is a high-severity missing authorization vulnerability in Cockpit CMS, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Cockpit CMS contains a missing authorization vulnerability in the Bucket file storage API (/system/buckets/api). The api() method in modules/System/Controller/Buckets.php executes bucket commands (ls, upload, removefiles, rename, createfolder) without performing any ACL or role check. Any authenticated user, regardless of role, can perform all bucket operations on any named bucket, including buckets intended for admin use only.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-57855?


## How do I fix CVE-2026-57855?

No fix has been published for CVE-2026-57855 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57855 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57855 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57855 and fix it if it is affected.

What it is: CVE-2026-57855 is a high-severity missing authorization vulnerability in Cockpit CMS, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57855 exists.

Affected product: Cockpit CMS. 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-2026-57855/ (Markdown: https://insights.sbomify.com/CVE-2026-57855/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57855
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57855
- OSV: https://osv.dev/vulnerability/CVE-2026-57855

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57855/
Summaries are generated and may contain mistakes; the official description above is the record.