CVE-2026-55188 RustFS: ListRemoteTargetHandler authorization bypass leaks replication target credentials
An authenticated user can bypass authorization checks to list remote replication targets, exposing sensitive access keys and secret keys.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55188?
CVE-2026-55188 is a high-severity missing authorization vulnerability in rustfs, published on 26 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.
Which versions are affected by CVE-2026-55188?
How do I fix CVE-2026-55188?
No fix has been published for CVE-2026-55188 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-55188 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55188 exists.
Sources
Also known as GHSA-796f-j7xp-hwf4.