Access Control Bypass Affecting samba package, versions [,4.24.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 May 2026
- disclosed27 May 2026
- creditAsim Viladi Oglu Manizada
Introduced: 27 May 2026
CVE-2026-1933 (opens in a new tab)How to fix?
Upgrade samba to version 4.24.3 or higher.
Overview
Affected versions of this package are vulnerable to Access Control Bypass in the handling of NTFS-style reparse points on shares configured with read only = yes. An attacker can modify file behavior, such as converting files into symbolic links or other reparse point types, by creating or deleting reparse point metadata through SMB operations even on read-only exports if they have underlying filesystem write permissions.
Workaround
This vulnerability can be mitigated by ensuring users who access a read only = yes Samba share do not have filesystem-level write permission to the exported files. A server administrator may also monitor and remove unintended "user.SmbReparse" xattr (extended attributes) and the associated FILE_ATTRIBUTE_REPARSE_POINT "user.DosAttrib" bit metadata if exploitation is suspected.