CVE-2026-73285CWE-863broken-access-control

CVE-2026-73285

High · published August 12, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
39.3
In the wild
Unconfirmed
What it is

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00465 · 39.3th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-08-12T19:18Z
References (5)
https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47 · [email protected]https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d · [email protected]https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1 · [email protected]https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2 · [email protected]https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 12 AUG 14:37Z
    RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged
    cvelistv5