RustFS: FTPS MKD bypasses IAM CreateBucket authorization (CVE-2026-73287) | HOL Guard CVE

Medium · CVSS 5.4CVE-2026-73287

RustFS: FTPS MKD bypasses IAM CreateBucket authorization

Answer in brief

CVE-2026-73287 records a Medium severity (CVSS 5.4) vulnerability in RustFS: FTPS MKD bypasses IAM CreateBucket authorization. The current sources do not mark it as known exploited. The current feed maps rustfs/rustfs (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 12, 2026Updated Sep 9, 2026Source checked Sep 28, 2026First seen by HOL Aug 12, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.4
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps rustfs/rustfs (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
rustfs/rustfsgeneric	< 1.0.0-beta.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for rustfs/rustfs.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 12, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.