Improper access control in Samba - CVE-2026-1933
Published: May 27, 2026
Vulnerability identifier: #VU132340
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-1933
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Samba
Affected software:
Samba
Samba
Detailed vulnerability description
The vulnerability allows a remote user to modify reparse point metadata on files despite read-only share restrictions.
The vulnerability exists due to improper access control in reparse point operations when handling set or delete requests for reparse point xattrs on files through a read-only share or a read-only file handle. A remote user can set or delete reparse point xattrs on files to modify reparse point metadata on files despite read-only share restrictions.
The issue occurs on shares configured with "read only = yes" and on file handles opened read-only, for files where the user has write access in the underlying file system.
How to mitigate CVE-2026-1933
Install security update from vendor's website.