CVE-2026-93853
CVE-2026-93853 is a high-severity vulnerability with a CVSS 4.0 base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-283.
Key facts
- Severity: High (CVSS 4.0 base score 7.2)
- EPSS exploit prediction: 0% (10th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-283
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-93853?
- 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.
- How severe is CVE-2026-93853?
- CVE-2026-93853 has a CVSS 4.0 base score of 7.2, rated high severity.
- Is CVE-2026-93853 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-93853?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2026-93853 published?
- CVE-2026-93853 was published on 2026-09-29 and last updated on 2026-09-30.
References
Other CWE-283 vulnerabilities
- CVE-2026-85781 — High (CVSS 8.7): Unverified ownership of a storage access point in the volume deletion component of the Amazon EFS CSI Driver before…
- CVE-2026-26016 — High (CVSS 8.1): Wings is the server control plane for Pterodactyl, a free, open-source game server management panel. Prior to version…
- CVE-2021-24501 — High (CVSS 8.1): The Workreap WordPress theme before 2.2.2 had several AJAX actions missing authorization checks to verify that a user…
- CVE-2025-43882 — High (CVSS 7.8): Dell ThinOS 10, versions prior to 2508_10.0127, contains an Unverified Ownership vulnerability. A local low-privileged…
- CVE-2026-4269 — High (CVSS 7.5): A missing S3 ownership verification in the Bedrock AgentCore Starter Toolkit before version v0.1.13 may allow a remote…
- CVE-2026-29788 — High (CVSS 7.5): TSPortal is the WikiTide Foundation’s in-house platform used by the Trust and Safety team to manage reports,…