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 ↗

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

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

← All CVEs