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

Vulnerability from cvelistv5 – Published: 2026-09-29 20:55 – Updated: 2026-09-29 20:55
VLAI
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
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
EnterpriseDB Barman Affected: 3.4.0 , < 3.20.1 (custom)
guessed Create a notification for this product.
Credits
Mufeed VH of Winfunc
Show details on NVD website
To clipboard 

{
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        {
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          "defaultStatus": "unaffected",
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            }
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Mufeed VH of Winfunc"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "vectorString": "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",
            "version": "4.0"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-283",
              "description": "CWE-283 Unverified Ownership",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T20:55:51.959Z",
        "orgId": "20be33e2-bf35-4d13-8fad-18bd2f3e3659",
        "shortName": "EDB"
      },
      "references": [
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          "url": "https://www.enterprisedb.com/docs/security/advisories/cve202693853/"
        }
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      "solutions": [
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          "lang": "en",
          "value": "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."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Barman snapshot backup deletion trusts unverified backup catalog metadata",
      "workarounds": [
        {
          "lang": "en",
          "value": "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."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "20be33e2-bf35-4d13-8fad-18bd2f3e3659",
    "assignerShortName": "EDB",
    "cveId": "CVE-2026-93853",
    "datePublished": "2026-09-29T20:55:51.959Z",
    "dateReserved": "2026-09-18T18:52:15.463Z",
    "dateUpdated": "2026-09-29T20:55:51.959Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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        "descriptions": [
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            "value": "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": "CVE-2026-93853",
        "lastModified": "2026-09-29T21:19:39.140",
        "metrics": {
          "cvssMetricV40": [
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              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
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                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 7.2,
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "LOW",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "HIGH",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
                "version": "4.0",
                "vulnAvailabilityImpact": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "source": "20be33e2-bf35-4d13-8fad-18bd2f3e3659",
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        "sourceIdentifier": "20be33e2-bf35-4d13-8fad-18bd2f3e3659",
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      }
    }
  }
}



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