CVE-2026-73287 RustFS: FTPS MKD bypasses IAM CreateBucket authorization
Authenticated FTPS users can bypass authorization checks to create buckets despite lacking S3 CreateBucket permissions.
- 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-2026-73287?
CVE-2026-73287 is a medium-severity missing authorization vulnerability in rustfs, published on 12 Aug 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. Prior to 1.0.0-beta.12, RustFS handles FTPS MKD in FtpsDriver::mkd in crates/protocols/src/ftps/driver.rs by calling storage.create_bucket without authorize_operation for S3Action::CreateBucket, allowing authenticated FTPS users denied s3:CreateBucket to create buckets. This issue is fixed in version 1.0.0-beta.12.
Weakness: CWE-862
Which versions are affected by CVE-2026-73287?
How do I fix CVE-2026-73287?
No fix has been published for CVE-2026-73287 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-2026-73287 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73287 exists.
Sources
Also known as GHSA-g3vq-vv42-f647.