Vulnerability-Lookup

CVE-2026-93853 (GCVE-0-2026-93853)

Vulnerability from cvelistv5 – Published: 2026-09-29 20:55 – Updated: 2026-09-30 15:28

Title

Barman snapshot backup deletion trusts unverified backup catalog metadata

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 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.

Severity

7.2 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 15:04 UTC

CWE

CWE-283 - Unverified Ownership

Assigner

EDB CNA under the mitre root

CNA scorecard C 67/100 over 10 records in the last 180 days details

References

1 reference

URL	Tags
https://www.enterprisedb.com/docs/security/adviso…

Impacted products

1 product

Vendor	Product	Version	CPE status
EnterpriseDB	Barman	Affected: 3.4.0 , < 3.20.1 (custom)	guessed

Credits

Mufeed VH of Winfunc

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-93853

Vulnerability from fkie_nvd - Published: 2026-09-29 21:19 - Updated: 2026-09-30 19:57

Severity

7.2 (High) - 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

Summary

References

	URL	Tags
	20be33e2-bf35-4d13-8fad-18bd2f3e3659	https://www.enterprisedb.com/docs/security/advisories/cve202693853/

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/EnterpriseDB/barman",
          "defaultStatus": "unaffected",
          "product": "Barman",
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            }
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      ],
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    }
  ],
  "id": "CVE-2026-93853",
  "lastModified": "2026-09-30T19:57:08.043",
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}

GHSA-HJPG-Q85J-GWXX

Vulnerability from github – Published: 2026-09-29 21:33 – Updated: 2026-09-29 21:33

Details

Severity

7.2 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-93853"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-283"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-29T21:19:39Z",
    "severity": "HIGH"
  },
  "details": "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\u0027s delete API using Barman\u0027s 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.",
  "id": "GHSA-hjpg-q85j-gwxx",
  "modified": "2026-09-29T21:33:27Z",
  "published": "2026-09-29T21:33:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93853"
    },
    {
      "type": "WEB",
      "url": "https://www.enterprisedb.com/docs/security/advisories/cve202693853"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

UBUNTU-CVE-2026-93853 (CVE-2026-93853)

Vulnerability from osv_ubuntu – Published: 2026-09-29 21:19 – Updated: 2026-10-17 09:58 – Source website

Details

Severity

7.2 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-93853	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-93853	REPORT
	https://www.enterprisedb.com/docs/security/adviso…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "1.5.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@1.5.1-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.1-1",
        "1.5.0-1",
        "1.5.1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "2.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@2.3-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2-1",
        "2.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "2.10-2"
          },
          {
            "binary_name": "barman-cli",
            "binary_version": "2.10-2"
          },
          {
            "binary_name": "python3-barman",
            "binary_version": "2.10-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@2.10-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9-1",
        "2.9-2",
        "2.10-1",
        "2.10-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "2.18-1"
          },
          {
            "binary_name": "barman-cli",
            "binary_version": "2.18-1"
          },
          {
            "binary_name": "barman-cli-cloud",
            "binary_version": "2.18-1"
          },
          {
            "binary_name": "python3-barman",
            "binary_version": "2.18-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@2.18-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.13-1",
        "2.15-1",
        "2.16-1",
        "2.17-1",
        "2.18-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "3.10.0-1"
          },
          {
            "binary_name": "barman-cli",
            "binary_version": "3.10.0-1"
          },
          {
            "binary_name": "barman-cli-cloud",
            "binary_version": "3.10.0-1"
          },
          {
            "binary_name": "python3-barman",
            "binary_version": "3.10.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@3.10.0-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.6.0-1",
        "3.9.0-1",
        "3.10.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "3.19.1-3"
          },
          {
            "binary_name": "barman-cli",
            "binary_version": "3.19.1-3"
          },
          {
            "binary_name": "barman-cli-cloud",
            "binary_version": "3.19.1-3"
          },
          {
            "binary_name": "python3-barman",
            "binary_version": "3.19.1-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@3.19.1-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.18.0-1",
        "3.18.0-2",
        "3.19.1-1",
        "3.19.1-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "barman",
            "binary_version": "3.18.0-1"
          },
          {
            "binary_name": "barman-cli",
            "binary_version": "3.18.0-1"
          },
          {
            "binary_name": "barman-cli-cloud",
            "binary_version": "3.18.0-1"
          },
          {
            "binary_name": "python3-barman",
            "binary_version": "3.18.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "barman",
        "purl": "pkg:deb/ubuntu/barman@3.18.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.14.1-1",
        "3.16.0-1",
        "3.17.0-1",
        "3.18.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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\u0027s delete API using Barman\u0027s 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.",
  "id": "UBUNTU-CVE-2026-93853",
  "modified": "2026-10-17T09:58:11Z",
  "published": "2026-09-29T21:19:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-93853"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-93853"
    },
    {
      "type": "REPORT",
      "url": "https://www.enterprisedb.com/docs/security/advisories/cve202693853/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-93853"
  ]
}

Solutions

CNA · EDB

Upgrade to Barman 3.20.1 or later. Before deleting a snapshot, Barman now reads the snapshot name from the cloud provider and refuses the deletion unless it matches the backup being deleted.

Workarounds

CNA · EDB

Restrict write access to the backup catalog in object storage to the identity Barman uses. Enable object versioning or object lock on the backup bucket, and on AWS use EBS Snapshot Lock (aws_snapshot_lock_mode) to protect snapshots from deletion.

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-93853 (GCVE-0-2026-93853)

FKIE_CVE-2026-93853

GHSA-HJPG-Q85J-GWXX

UBUNTU-CVE-2026-93853 (CVE-2026-93853)

Solutions

Workarounds

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour