---
id: CVE-2026-93853
title: >-
  Unverified ownership in Barman snapshot backup deletion allows a principal who
  can write the backup catalog to cause Barman to delete unrelated cloud
  snapshots
summary: >-
  Unverified ownership in Barman snapshot backup deletion allows a principal who
  can write the backup catalog to cause Barman to delete unrelated cloud
  snapshots. When a snapshot backup is deleted, either explicitly or by
  retention policy …
severity: high
cvss: 7.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H'
cwe:
  - CWE-283
vendor: EnterpriseDB
product: Barman
affected:
  - Barman >= 3.4.0 < 3.20.1
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T21:19:39.140'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93853'
references:
  - url: 'https://www.enterprisedb.com/docs/security/advisories/cve202693853/'
    label: 20be33e2-bf35-4d13-8fad-18bd2f3e3659
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T21:49:08.217Z'
---

## Overview

Unverified ownership in Barman snapshot backup deletion allows a principal who can write the backup catalog to cause Barman to delete unrelated cloud snapshots. When a snapshot backup is deleted, either explicitly or by retention policy enforcement, Barman reads the snapshot identifiers from the backup.info file and passes them to the cloud provider's delete API using Barman's own credentials, without verifying that the snapshots belong to that backup. An attacker who can overwrite backup.info but lacks snapshot delete permissions can substitute the identifiers of other snapshots, causing Barman to delete any snapshot its cloud identity can reach on AWS, Microsoft Azure, or Google Cloud. Exploitation requires a deployment where the principal that writes the backup catalog is separate from the identity Barman uses to delete snapshots. Barman versions from 3.4.0 (Google Cloud), 3.6.0 (Azure), and 3.7.0 (AWS) up to and including 3.20.0 are affected. The issue is fixed in Barman 3.20.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.