Security readout for executives and security teams
Plain-English summary
This is a high-severity local privilege escalation in Microsoft Azure AD SSH Login extension for Linux. A local unauthorized attacker could potentially gain elevated privileges on affected Linux systems. Treat it as important for Azure Linux hosts using this extension, but the provided sources do not show active exploitation.
Executive priority
High priority for Azure Linux environments using this extension. The issue can affect full system confidentiality, integrity, and availability, but current evidence points to local, high-complexity exploitation and no confirmed active exploitation.
Technical view
CVE-2026-26148 is attributed to external initialization of trusted variables or data stores in Azure Entra ID. The affected product listed is Microsoft Azure AD SSH Login extension for Linux version 1.0.0. The CVSS 3.1 score is 8.1, with local attack vector, high complexity, no privileges required, changed scope, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure appears limited to Linux systems running Microsoft Azure AD SSH Login extension for Linux version 1.0.0. The bundle does not identify other affected versions or products.
Exploitation context
The CVSS vector indicates local access is required and attack complexity is high. The exploit maturity value is proof-of-concept, but KEV is false and the supplied sources do not support active exploitation claims.
Researcher notes
The public bundle is sparse: it names the weakness class, product, affected version, severity, and Microsoft advisory, but does not include root-cause detail, exploit mechanics, or workaround specifics. Avoid assuming broader Azure Entra ID exposure beyond the listed Linux SSH Login extension.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2026-26148 and apply the official update path.
- Prioritize Azure Linux hosts using the affected SSH login extension.
- Restrict local and SSH access to trusted administrators while remediation is pending.
- Monitor Microsoft guidance for any expanded affected-version or workaround details.
Validation and detection
- Inventory Azure Linux hosts for Azure AD SSH Login extension for Linux version 1.0.0.
- Confirm remediated hosts no longer report the affected extension version.
- Check vulnerability management tools for CVE-2026-26148 coverage and detection status.
- Review privileged access logs for unusual local privilege changes on affected hosts.
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
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CWE-454: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26148 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
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
1 official scoreWe 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:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C1.46microsoftVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
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.
- 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
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
External Initialization of Trusted Variables or Data Stores
External Initialization of Trusted Variables or Data Stores represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.