---
title: "CVE-2026-97731: MinIO - Broken Access Control"
description: "MinIO through 7aac2a2 contains a broken access control vulnerability caused by improper verification of x-amz-* headers in signature validation, letting attackers with presigned PUT URLs perform unauthorized server-side copies, exploit requires possession of a presigned PUT URL."
url: https://panop.io/threat-heartbeat/CVE-2026-97731/
---

# CVE-2026-97731 MinIO - Broken Access Control

MinIO through 7aac2a2 contains a broken access control vulnerability caused by improper verification of x-amz-\* headers in signature validation, letting attackers with presigned PUT URLs perform unauthorized server-side copies, exploit requires possession of a presigned PUT URL.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-97731)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Published

25 September 2026

Updated

15 October 2026

Weakness

[CWE-347](https://cwe.mitre.org/data/definitions/347.html)

## Vendor fix

Update to a version after 7aac2a2 or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-97731](https://nvd.nist.gov/vuln/detail/CVE-2026-97731)
- [https://github.com/pgsty/silo/commit/1233254309b15571f101b2b26d531951ceaeef1e](https://github.com/pgsty/silo/commit/1233254309b15571f101b2b26d531951ceaeef1e)
- [https://silo.pgsty.com/about/security-advisories/#sn-2026-011](https://silo.pgsty.com/about/security-advisories/#sn-2026-011)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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