CVE-2026-93853 Details
Description
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.
A vulnerability in Barman's snapshot backup deletion process allows for the unauthorized deletion of cloud snapshots. This issue arises because Barman does not verify whether a snapshot belongs to the backup being deleted before executing the deletion. When a backup is removed, Barman reads snapshot identifiers from the backup's 'backup.info' file and sends them to the cloud provider's delete API using Barman's own credentials. An attacker who can overwrite 'backup.info' but lacks permission to delete snapshots can replace the identifiers with those of unrelated snapshots. As a result, Barman may delete any snapshot accessible through its cloud identity on AWS, Microsoft Azure, or Google Cloud. Exploitation requires a setup where the principal writing the backup catalog is different from the identity Barman uses for deletions. Barman versions 3.4.0 (Google Cloud), 3.6.0 (Azure), and 3.7.0 (AWS) up to and including 3.20.0 are affected. The vulnerability is fixed in Barman 3.20.1.
Users must upgrade to Barman 3.20.1 or later. Google Cloud users should grant the 'compute.snapshots.get' permission to the service account Barman uses, as this permission is required for snapshot verification before deletion.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 29, 2026CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.enterprisedb.com/docs/security/advisories/cve202693853/ | EnterpriseDB Corporation | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-283 | Unverified Ownership | EnterpriseDB Corporation |
Affected Products
| Product | Versions |
|---|---|
| Barman | >= 3.4.0, <= 3.20.0 (semver) >= 3.6.0, <= 3.20.0 (semver) >= 3.7.0, <= 3.20.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 30, 2026 | CVE Modified | CISA-ADP |
| Sep 29, 2026 | New CVE Received | EnterpriseDB Corporation |