# CVE-2026-57855 — Cockpit CMS

> As of 2026-07-14, CVE-2026-57855 is a HIGH-severity vulnerability in Cockpit CMS, CVSS v3.1 8.8, EPSS 0.2% (20.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-57855 as of 2026-07-14; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-14

## What is CVE-2026-57855?

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.

The record classifies CVE-2026-57855 under weakness class [CWE-284](https://intel.threadlinqs.com/cwe/CWE-284). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 84 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **CVSS v4.0 base score:** 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`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-13, last modified 2026-07-14

## Is CVE-2026-57855 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Cockpit HQ**: Cockpit CMS

## How to fix CVE-2026-57855

No vendor patch reference has been recorded for CVE-2026-57855 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-57855

No threat campaign in the Threadlinqs corpus currently references CVE-2026-57855, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-07-15. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — patch](https://github.com/Cockpit-HQ/Cockpit/commit/dde2d1d74f5f4e11de42a298918ea8c9684f932c)

**Technical analysis**

- [gist.github.com — technical description](https://gist.github.com/sermikr0/821c4edd3c34e98a62a50b07707785bd)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/cockpit-cms-missing-authorization-in-bucket-file-storage-api)

**Issue tracking and product pages**

- [github.com — product](https://github.com/cockpit-hq/cockpit)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-57855
Full detection coverage and IOCs for threats exploiting CVE-2026-57855 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp