---
title: "CVE-2026-109411: Samba - Access Control Bypass"
description: "Samba contains an access control bypass caused by incorrect case-insensitive lookup in vfs_ceph_rgw module's openat() function, letting authenticated users read or overwrite restricted files on configured shares, exploit requires authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-109411/
---

# CVE-2026-109411 Samba - Access Control Bypass

Samba contains an access control bypass caused by incorrect case-insensitive lookup in vfs\_ceph\_rgw module's openat() function, letting authenticated users read or overwrite restricted files on configured shares, exploit requires authentication.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109411)

## Details

Type

Access Control Bypass

Impact

Data Tampering, Information Disclosure

CVSS vector

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

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-178](https://cwe.mitre.org/data/definitions/178.html)

## Vendor fix

Update to the latest Samba version with vfs\_ceph\_rgw module fixes.

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-2026-109411](https://nvd.nist.gov/vuln/detail/CVE-2026-109411)
- [https://attachments.samba.org/attachment.cgi?id=19295](https://attachments.samba.org/attachment.cgi?id=19295)
- [https://bugzilla.redhat.com/show\_bug.cgi?id=2552136](https://bugzilla.redhat.com/show_bug.cgi?id=2552136)
- [https://bugzilla.samba.org/show\_bug.cgi?id=16276](https://bugzilla.samba.org/show_bug.cgi?id=16276)
- [https://access.redhat.com/security/cve/CVE-2026-109411](https://access.redhat.com/security/cve/CVE-2026-109411)
- [https://attachments.samba.org/attachment.cgi?id=19294](https://attachments.samba.org/attachment.cgi?id=19294)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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