Security readout for executives and security teams
Plain-English summary
CVE-2026-1933 lets authenticated users bypass the intended read-only behavior of some Samba shares when they still have write permission on the underlying filesystem. They may alter reparse point metadata, changing how files appear or behave over SMB. The main business risk is integrity and availability impact on shared file services.
Executive priority
Treat as high priority for enterprise file-sharing environments, especially where read-only shares protect operational, software, or shared business data. Patch during the next urgent maintenance window and reduce filesystem write access immediately where feasible.
Technical view
Samba does not consistently enforce SMB-layer access checks for NTFS-style reparse point create/delete operations on shares configured with read only = yes. If an authenticated user has filesystem write permissions underneath the export, SMB operations may still modify reparse metadata, including symbolic link-like behavior.
Likely exposure
Most relevant exposure is Samba on affected Red Hat Enterprise Linux 7, 8, 9, 10 variants and Red Hat OpenShift Container Platform 4.19 RHCOS where read-only SMB shares map to paths writable by authenticated users.
Exploitation context
The bundle reports no KEV listing and provides no evidence of active exploitation. Abuse requires authentication and underlying filesystem write permission, but network access and low attack complexity make this important for shared file servers.
Researcher notes
The key condition is the mismatch between Samba share read-only policy and underlying filesystem write rights. CVSS is 7.1 with integrity and availability impact. Evidence is Red Hat-focused; the bundle does not establish exploit availability or broader non-Red Hat impact.
Mitigation direction
- Apply the applicable Red Hat security advisory updates for affected Samba or RHCOS packages.
- Review vendor guidance for fixed package versions and platform-specific remediation steps.
- Remove unnecessary filesystem write permissions behind read-only Samba exports.
- Audit shares using read only = yes for mismatched filesystem ACLs.
- Prioritize externally reachable or broadly accessible SMB services first.
Validation and detection
- Inventory Samba and RHCOS versions against the affected Red Hat product list.
- Identify SMB shares configured with read only = yes.
- Check whether authenticated users retain filesystem write permissions on exported paths.
- Confirm reparse point metadata cannot be created or deleted through SMB after remediation.
- Track remediation against the relevant RHSA advisory for each platform.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-1933 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H2.84.2redhatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H2.84.2redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-03-13T08:29:39.852Z: Reported to Red Hat.
- 2026-05-27T12:08:33.095Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:22644CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:22963CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:25049CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:25979CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:28053CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:28054CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:28055CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:28056CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:28057CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:29863CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-1933CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2447317CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://bugzilla.samba.org/show_bug.cgi?id=15992CVE reference, redhat
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1933.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.