CVE-2026-57856
Authenticated path traversal in Cockpit CMS Bucket API allows cross-bucket file access and modification.
Is CVE-2026-57856 being exploited?
Not confirmed. CVE-2026-57856 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.61% probability of exploitation in the next 30 days.
How severe is CVE-2026-57856?
CVE-2026-57856 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-57856?
Not known from our data. No patch reference has been recorded for CVE-2026-57856, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-57856 affect?
CVE-2026-57856 affects Cockpit CMS (Bucket API), modules/System/Controller/Buckets.php, Flysystem uploads storage. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57856?
Restrict access to /system/buckets/api, disable risky accounts, audit logs, and apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated low-privileged user can list, upload, and delete files across all buckets, exposing or altering other users' data (privilege escalation/data tamper).
Immediate action required
- affected< 2.14.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.