CVE-2026-93853 Barman snapshot backup deletion trusts unverified backup catalog metadata
An attacker with write access to the backup catalog can delete arbitrary cloud snapshots by manipulating metadata, requiring a split-identity deployment configuration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93853?
CVE-2026-93853 is a high-severity missing authorization vulnerability in EnterpriseDB Barman, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-283
Which versions are affected by CVE-2026-93853?
How do I fix CVE-2026-93853?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93853 being exploited?
There is no known exploitation of CVE-2026-93853 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93853, GHSA-hjpg-q85j-gwxx, UBUNTU-CVE-2026-93853.