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CVE-2026-109411

8.1, high

An access control bypass flaw was found in Samba's vfs_ceph_rgw module in it's openat() function

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.1, high high CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
28 Oct 2026yesterday

Description

An access control bypass flaw was found in Samba's vfs_ceph_rgw module in it's openat() function. An authenticated user can bypass access controls to read or overwrite restricted files on shares configured with the experimental vfs_ceph_rgw module. When a client requests an existing file using mismatched character casing, the module fails to perform a case-insensitive lookup correctly, causing the server to treat the operation as creating a new file. As a result, the server skips standard permission checks on the existing file, allowing the attacker to access or overwrite sensitive data owned by other users.

Details

Vendor
Samba and 1 more
Product
Samba
Weakness
CWE-178 (opens in a new tab)
Status
Awaiting analysis
Updated
28 Oct 2026
Assigner
secalert@redhat.com

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

References 5

Advisories 1

Other references 4

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Samba CVEs

Every Samba CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2017-7494 Samba Remote Code Execution Vulnerability KEV EPSS 99% 9.8, critical

Beyond this page

Is CVE-2026-109411 in your network?

This page tells you how dangerous CVE-2026-109411 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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    Detect it if it's exploited

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 29 Oct 2026, not the live upstream state.